Cleaned boiler heat exchanger and vacuumed remaining soot from under boiler. Replaced burners. Opened boiler blow down valves. Tested low water cut of and pump. Water level remains above lowest permissible level however sigh glass on boiler remains empty. (Sight glass is located above lowest permissible level which is unique to Peerless boilers). Tested thermostat operation. Steam pressure remained between .5 and .75 PSI: Good Combustion test showed higher C0 levels which is normal considering boiler was just cleaned. 02 and C02 numbers ok. Boiler is operating well at the time of this service.