1ST MAINT. TUNE-UP UNDER SERVICE AGREEMENT FOR 2 YR HT UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, THERMOSTAT, AIRFLOW, AIR FILTER, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY PARTS AND FOR PROPER VENTING. EVERYTHING IS RUNNING GOOD.