SECOND MAINT. CHECK-UP UNDER SERVICE AGREEMENT FOR 16YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, ENERGY CONSUMPTION, FAN CONTROL, HEAT EXCHANGER, HIIGH LIMIT CONTROL, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS.