Completed heating maintenance on One steam boiler removed and clean burners and electronic ignition also clean burner trays removed pressure, trolls, and cleaned brass fittings reinstall turn system on checked lower cut off and automatic water fill check natural gas lines and also checked for carbon monoxide. None detected discussed with homeowner about replacement of thermostat which was declined. Left system working. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-A243-2EC87764436549B7BD7C90787580B581