I responded to a call regarding a loud noise during furnace operation. Upon arrival, I traced the noise to the burner motor. After confirming that the motor was the source of the issue and receiving approval, I replaced the burner motor. During the inspection, I also found that the oil tank level gauge had failed, and with approval, I replaced that as well. The furnace had not been cleaned since 2023, so I recommended a maintenance service and proceeded with a full annual cleaning. I performed annual maintenance on the Spirit oil furnace by replacing the nozzle, oil filter, and pump strainer. I brushed and vacuumed the heat exchanger and flue pipe, noting excessive rust and debris throughout both areas. I sealed the flue connection with furnace cement and sealed the clean-out cover with high-temperature silicone. I verified that there was no contamination between the supply air and the products of combustion. All system safeties and burner components were tested and confirmed to be op