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