Drained the boiler pressure. Removed and cleaned the cold water inlet filter and the drain plug strainer. Removed and cleaned the air intake filter. Checked all wiring connections and safeties. Inspected and cleaned the burner and surrounding area. Filled system back up with water. Checked gas pressures and performed combustion test. 5.6%o2 13ppm co Need to have installer come back and rotate/replace a fitting so the drain valve behind the gas line can be accessed. Also need to install an autofeed so water can be manually added to the system