Perform the maintenance for the oil fire boiler, replace the nozzle, oil filter, and pump screen. Opened the top of the boiler, brushed and vacuumed the flu passages and confirmed that the chimney base is clean. Reassembled the top and installed all screws into the flue piping. Started up the boiler and performed a full combustion analysis on it, the boiler is operating properly at this time. Also confirm that these own valves are both operating as well.