Sec. 2.10. ACTION INCREASING AMORTIZATION PERIOD. Notwithstanding any other provision of this Act, the rate of contributions to the pension fund may not be reduced or eliminated, a new monetary benefit payable by the pension fund may not be established, and the amount of a monetary benefit from the fund may not be increased, if, as a result of the particular action, the time, as determined by an actuarial valuation, required to amortize the unfunded actuarial liabilities of the pension fund would be increased to a period that exceeds 25 years.