Section 658-109-5 - MAINTENANCE1. All oil burning equipment and systems, both new and existing, and parts thereof shall be maintained in a safe condition.2. When performing any service on a customer's heating system, the licensee must notify the homeowner of any code violations and make recommendations to address them.3. When performing an annual tune-up on a heating system, a combustion efficiency test must be conducted and a copy of the test must be posted on-site.02-658 C.M.R. ch. 109, § 5