Cal. Gov. Code § 75026
Except as provided in Section 75029, no judge shall be eligible to retire under Section 75025 if he or she has not received a salary from which contributions for the Judges' Retirement Fund have been deducted for a period or periods aggregating at least 10 years unless, prior to the effective date of his or her retirement, he or she has paid into the Judges' Retirement Fund a sum equal to the contributions which would have been deducted from his or her salary during the period of 10 years immediately preceding the effective date of his or her retirement if he or she had received a salary subject to deduction of contributions for the Judges' Retirement Fund during all of that period, excluding any time within the 10-year period during which contributions for the Judges' Retirement Fund were actually deducted from his or her salary, any time in that period in respect to which he or she has made payment under Section 75029, and any time in that period which is included in the computation of his or her service under Section 75031. The sum payable shall be computed by applying the rate or rates of deduction applicable to judges' salaries during that time to the salary which the judge last received as the incumbent of a judicial office to which he or she was elected by the people.
Ca. Gov. Code § 75026