Mich. Comp. Laws § 38.1058a
If a change or error in the records of the retirement system results in a retirant, retirement allowance beneficiary, or refund beneficiary receiving from the retirement system more or less than the retirant, retirement allowance beneficiary, or refund beneficiary would have been entitled to receive had the records been correct, the retirement system shall correct the error, and as far as practicable, shall adjust the payment to provide an actuarial equivalent of the benefit to which the retirant, retirement allowance beneficiary, or refund beneficiary was entitled. An adjustment in benefits shall not be made for an error totaling $10.00 or less annually and the amount shall be debited or credited to the members' retirement fund.
MCL 38.1058a