Comtune complete. Replaced both air filters. Inspected and cleaned spark ignition, flame sensor, burners, gas valve, inducer, blower, belt, run caps, safeties, controls and cabinet. Replaced cracked blower drive belt and cycled with ok operation at this time from tstat. Reset tstat to the way it was found. Had to go get belt at part store. Tuneup and filter change $178 new belt $58. Poor cell reception on my end.