Section 73653 - Maintenance Manual(a) A written manual on maintenance of heating, air conditioning and ventilation systems shall be adopted by each facility.(b) A maintenance log shall be maintained.(c) Where maintenance is performed by an equipment service company, a certification shall be provided to the licensee that the required work has been performed in accordance with acceptable standards. This certification shall be retained on file in the facility.Cal. Code Regs. Tit. 22, § 73653