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