1ST 13 POINT MAINTENANCE TUNE-UP UNDER SERVICE AGREEMENT FOR 3 YR HT UNIT. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, HEAT EXCHANGER, HIGH LIMIT CONTROL, ENERGY CONSUMPTION, BURNERS, AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, ADJUST BLOWER COMPONENTS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. EVERYTHING IS RUNNING GREAT.