MAINTENANCE TUNE-UP UNDER SERVICE AGREEMENT FOR 3 YR HT UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK ENERGY CONSUMPTION,THERMOSTAT, AIRFLOW, AIR FILTER, FAN CONTROL, HIGH LIMIT CONTROL, HEAT EXCHANGER, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS RUNNING GOOD.