Cal. Gov. Code § 15825
The board may provide, by resolution, for the issuance of refunding certificates for the purpose of refunding any certificates of the board issued pursuant to this part and then outstanding, either by voluntary exchange with the holders of the outstanding certificates, or to provide funds to redeem and retire the outstanding certificates, with accrued interest and any redemption value payable on any call date. The issuance of the refunding certificates, the maturities and other details of the certificates, the rights of the certificate holders, and the duties of the board in respect to the certificates, are governed by the provisions of this part insofar as they are applicable. Refunding certificates may be issued by the board to refund certificates originally issued or to refund certificates of the board previously issued for refunding purposes.
Ca. Gov. Code § 15825