California Code, Education Code - EDC § 24340

(a) A member who has a preretirement election of an option in effect on December 31, 1990, may change his or her preretirement election of Option 2, Option 3, Option 4, or Option 5 to either Option 6 or Option 7 without the allowance reduction prescribed in Sections 24309 and 24310, provided the change is made on or after January 1, 1991, and prior to the earlier of January 1, 1992, or the member's retirement under this part.

(b) If the member elects to change his or her option under this section, then the member shall retain the same option beneficiary as named in the prior preretirement election. The election to change the preretirement election under this section shall be void if not received in the system's headquarters office at least 30 days prior to the death of the option beneficiary.