1ST MAINT. TUNE-UP PER SERVICE AGREEMENT FOR 12 YR HT UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, ENERGY CONSUMPTION, THERMOSTAT, AIRFLOW, AIR FILTER, AND ALL ELECTRICAL CONNECTIONS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. EVERYTHING IS WORKING GOOD. EVERYTHING IS RUNNING GOOD.