Exhibit 10.31 FIRST AMENDMENT TO EMPLOYMENT AGREEMENT THIS FIRST AMENDMENT TO EMPLOYMENT AGREEMENT (this "Amendment"), dated this 17th day of June, 2001, is made and entered into by and between Packard BioScience Company, a Delaware corporation (the "Company"), and Franklin R. Witney (the "Executive"). WHEREAS, the Company and the Executive entered into an employment agreement, dated December 18, 2000 (the "Employment Agreement"); and WHEREAS, the Company and Executive desire to amend the Employment Agreement to extend the term of the Employment Agreement as set forth herein. NOW, THEREFORE, in consideration of the mutual promises contained herein, and for other good and valuable consideration the receipt and sufficiency of which are hereby acknowledged, the Company and Executive hereby amend the Employment Agreement as follows: 1. Section 7(c), (A) and (B) of the Employment Agreement are hereby deleted in their entirety and replaced with the following: (A) The "Noncompetition Period" means the period from the date hereof through the date that is two years after the date on which the Employee's employment with the Company terminates. (B) "Competitive Business" means any business identified on EXHIBIT A attached hereto; 2. The EXHIBIT A attached hereto is hereby added to the Employment Agreement as EXHIBIT A thereto. 3. The following provision is hereby added to the Employment Agreement as new Section 13: 13. CERTAIN ADDITIONAL PAYMENTS BY THE COMPANY. (a) Anything in this Agreement to the contrary notwithstanding and except as set forth below, in the event it shall be determined that any payment or distribution by the Company to or for the benefit of the Executive (whether paid or payable or distributed or distributable pursuant to the terms of this Agreement or otherwise, but determined without regard to any additional payments required under this Section 13) (a "Payment") would be subject to the excise tax imposed by Section 4999 of the Internal Revenue Code of 1986, as amended (the "Code") or any interest or penalties are incurred by the Executive with respect to such excise tax (such excise tax, together with any such interest and penalties, are hereinafter collectively referred to as the "Excise Tax"), then the Executive shall be entitled to receive an additional payment (a "Gross-Up Payment") in an amount such that after payment by the Executive of all taxes (including any interest or penalties imposed with respect to such taxes), including, without limitation, any income taxes (and any interest and penalties imposed with respect thereto) and Excise Tax imposed upon the Gross-Up Payment, the Executive retains an amount of the Gross-Up Payment equal to the Excise Tax imposed upon the Payments. Notwithstanding the foregoing provisions of this Section 13(a), if it shall be determined that the Executive is entitled to a Gross-Up Payment, but that the Executive, after taking into account the Payments and the Gross-Up Payment, would not receive a net after-tax benefit of at least $30,000 (taking into account both income taxes and any Excise Tax) as compared to the net after-tax proceeds to the Executive resulting from an elimination of the Gross-Up Payment and a reduction of the Payments, in the aggregate, to an amount (the "Reduced Amount") such that the receipt of Payments would not give rise to any Excise Tax, then no Gross-Up Payment shall be made to the Executive and the Payments, in the aggregate, shall be reduced to the Reduced Amount. (b) Subject to the provisions of Section 13 (a), all determinations required to be made under this Section 13, including whether and when a Gross-Up Payment is required and the amount of such Gross-Up Payment and the assumptions to be utilized in arriving at such determination, shall be made by Arthur Andersen LLP or such other certified public accounting firm as may be designated by the Executive (the "Accounting Firm"), which shall provide detailed supporting calculations both to the Company and the Executive within 15 business days of the receipt of notice from the Executive that there has been a Payment, or such earlier time as is requested by the Company. All fees and expenses of the Accounting Firm shall be borne solely by the Company. Any Gross-Up Payment, as determined pursuant to this Section 13, shall be paid by the Company to the Executive within five days of the receipt of the Accounting Firm's determination. Any determination by the Accounting Firm shall be binding upon the Company and the Executive. As a result of the uncertainty in the application of Section 4999 of the Code at the time of the initial determination by the Accounting Firm hereunder, it is possible that Gross-Up Payments which will not have been made by the Company should have been made ("Underpayment"), consistent with the calculations required to be made hereunder. In the event that the Company exhausts its remedies pursuant to Section 13(c) and the Gross-Up Payments which will not have been made by the Company should have been made ("Underpayment"), consistent with the calculations required to be made hereunder. In the event that the Company exhausts its remedies pursuant to Section 13(c) and the Executive thereafter is required to make a payment of any Excise Tax, the Accounting Firm shall determine the amount of the Underpayment that has occurred and any such Underpayment shall be promptly paid by the Company to or for the benefit of the Executive. (c) The Executive shall notify the Company in writing of any claim by the Internal Revenue Service that, if successful, would require the payment by the Company of the Gross-Up Payment. Such notification shall be given as soon as practicable but no later than ten business days after the Executive is informed in writing of such claim and shall apprise the Company of the nature of such claim and the date on which such claim is requested to be paid. The Executive shall not pay such claim prior to the expiration of the 30-day period following the date on which he gives such notice to the Company (or such shorter period ending on the date that any payment of taxes with respect to such claim is due). If the Company notifies the Executive in writing prior to the expiration of such period that it desires to contest such claim, the Executive shall: (i) give the Company any information reasonably requested by the Company relating to such claim, (ii) take such action in connection with contesting such claim as the Company shall reasonably request in writing from time to time, including, without limitation, accepting legal representation with respect to such claim by an attorney reasonably selected by the Company, (iii) cooperate with the Company in good faith in order effectively to contest such claim, and (iv) permit the Company to participate in any proceedings relating to such claim; provided, however, that the Company shall bear and pay directly all costs and expenses (including additional interest and penalties) incurred in connection with such contest and shall indemnify and hold the Executive harmless, on an after-tax basis, for any Excise Tax or income tax (including interest and penalties with respect thereto) imposed as a result of such representation and payment of costs and expenses. Without limitation on the foregoing provisions of this Section 13(c), the Company shall control all proceedings taken in connection with such contest, and, at its sole option, may pursue or forgo any and all administrative appeals, proceedings, hearings and conferences with the taxing authority in respect of such claim and may, at its sole option, either direct the Executive to pay the tax claimed and sue for a refund or contest the claim in any permissible manner, and the Executive agrees to prosecute such contest to a determination before any administrative tribunal, in a court of initial jurisdiction and in one or more appellate courts, as the Company shall determine; provided, however, that if the Company directs the Executive to pay such claim and sue for a refund, the Company shall advance the amount of such payment to the Executive, on an interest-free basis and shall indemnify and hold the Executive harmless, on an after-tax basis, from any Excise Tax or income tax (including interest or penalties with respect thereto) imposed with respect to such advance or with respect to any imputed income with respect to such advance; and further provided that any extension of the statute of limitations relating to payment of taxes for the taxable year of the Executive with respect to which such contested amount is claimed to be due is limited solely to such contested amount. Furthermore, the Company's control of the contest shall be limited to issues with respect to which a Gross-Up Payment would be payable hereunder and the Executive shall be entitled to settle or contest, as the case may be, any other issue raised by the Internal Revenue Service or any other taxing authority. (d) If, after the receipt by the Executive of an amount advanced by the Company pursuant to Section 13(c), the Executive becomes entitled to receive any refund with respect to such claim, the Executive shall (subject to the Company's complying with the requirements of Section 13(c)) promptly pay to the Company the amount of such refund (together with any interest paid or credited thereon after taxes applicable thereto). If, after the receipt by the Executive of an amount advanced by the Company pursuant to Section 13(c), a determination is made that the Executive shall not be entitled to any refund with respect to such claim and the Company does not notify the Executive in writing of its intent to contest such denial of refund prior to the expiration of 30 days after such determination, then such advance shall be forgiven and shall not be required to be repaid and the amount of such advance shall offset, to the extent thereof, the amount of Gross-Up Payment required to be paid. 4. Except as specifically amended hereby, the Employment Agreement shall remain in full force and effect. 5. The Company and the Executive acknowledge that this Agreement supersedes any other agreement between them with respect to the subject matter hereof, and that this Amendment shall be incorporated into and shall form an integral part of the Employment Agreement. 6. This Amendment may be executed in several counterparts, each of which shall be deemed an original, and said counterparts shall constitute but one and the same instrument. IN WITNESS WHEREOF, the Executive has executed this Amendment and, pursuant to the authorization of its Board of Directors, the Company has caused this Amendment to be executed on its behalf, all as of the date first above written. EXECUTIVE /s/ Frank R. Witney 6/17/01 - --------------------------------- Frank R. Witney PACKARD BIOSCIENCE COMPANY /s/ Emery G. Olcott - ---------------------------------- Emery G. Olcott