Work Performed: Performed maintenance on Olsen natural draft boiler Cleaned flame sensor, burners, and combustion cavity Inspected vent damper and chimney venting up to the roof Checked all electrical components Conducted combustion analysis: verified clean combustion and excellent gas utilization Affixed boiler inspection tag as required by law for natural draft appliances While running the boiler, observed the pressure relief valve dripping and system pressure exceeding 40 PSI Identified the cause as a failed expansion tank—internal diaphragm has failed, leaving no space for water expansion Pressure relief valve is opening as a result of this over-pressurization Results: This type of boiler is required to have a yearly inspection by law; failure to do so may result in red-tagging due to carbon monoxide spillover risk associated with natural draft appliances Expansion tank and pressure relief valve need to be replaced to restore safe boiler operation Estimates for the recommended rep