Cal. Veh. Code § 2807.2

The Department of the California Highway Patrol shall, by regulation, provide for a preventive maintenance inspection guide for use by operators of tour buses, motor vehicles specified in Sections 2807 and 2807.1, and vehicles described in subdivisions (a), (b), (d), (e), (f), and (g) of Section 34500. The regulations shall provide that the record of inspection shall be signed by the person making the inspection, and the record of the inspections shall be retained on file by the operator for review and inspection by the Department of the California Highway Patrol.