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