CA Civ Code Section 8816

(a)

If the direct contractor gives the owner, or a subcontractor gives the direct contractor, notice that work in dispute has been completed in accordance with the contract, the owner or direct contractor shall within 10 days give notice advising the notifying party of the acceptance or rejection of the disputed work. Both notices shall comply with the requirements of Chapter 2 (commencing with Section 8100) of Title 1.

(b)

Within 10 days after acceptance of disputed work, the owner or direct contractor shall pay the portion of the retention relating to the disputed work.