Cal. Civ. Code § 8482

An owner of property may not petition the court for a release order under this article unless at least 10 days before filing the petition the owner gives the claimant notice demanding that the claimant execute and record a release of the claim of lien. The notice shall comply with the requirements of Chapter 2 (commencing with Section 8100) of Title 1, and shall state the grounds for the demand.