California Code, Code of Civil Procedure - CCP § 724.110

(a) The judgment debtor or the owner of real or personal property subject to a judgment lien created under a money judgment may serve on the judgment creditor a demand in writing that the judgment creditor execute, acknowledge, and deliver an acknowledgment of partial satisfaction of judgment to the person who made the demand. Service shall be made personally or by mail. If the judgment has been partially satisfied, the judgment creditor shall comply with the demand not later than 15 days after actual receipt of the demand.

(b) If the judgment creditor does not comply with the demand within the time allowed, the judgment debtor or the owner of the real or personal property subject to a judgment lien created under the judgment may apply to the court on noticed motion for an order requiring the judgment creditor to comply with the demand. The notice of motion shall be served on the judgment creditor. Service shall be made personally or by mail. If the court determines that the judgment has been partially satisfied and that the judgment creditor has not complied with the demand, the court shall make an order determining the amount of the partial satisfaction and may make an order requiring the judgment creditor to comply with the demand.