CLEAN AND CHECK HT. CHECK THERMOSTAT, CHECK BURNERS AND BURNER, CHECK GAS PRESSURE AND FOR PROPER VENTING, CHECK HEAT EXCHANGER, CHECK HIGH LIMIT CONTROL, CHECK AIR FILTER, CHECK ALL ELECTRICAL CONNECTIONS, CHECK HUMIDIFIER. ADJUST BLOWER COMPONENTS, LUBRICATE ALL NECESSARY MOVING PARTS. EVERYTHING IS RUNNING GREAT. RENEWED SERVIC AGREEMENT.