Pub. Util. Code, § 3092

The bylaws may prescribe the manner of determining the value of a member’s interest and provision for its purchase by the association upon the death or withdrawal of a member or upon the expulsion of a member or forfeiture of membership or, at the option of the association, the purchase at a price fixed by conclusive appraisal by the board of directors. In case of the expulsion of a member, and where the bylaws do not provide any procedure or penalty, the board of directors shall equitably and conclusively appraise the member’s property interest in the association and shall fix the amount of that property interest in money, which shall be paid to the member within one year after expulsion.