SECOND CLEAN AND CHECK FOR 3YR HEATING UNIT UNDER SERVICE AGREEMENT. RENEWED SERVICE SERVICE AGREEMENT. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK THERMOSTAT, AIR FILTER, HUMIDIFIER, AIRFLOW, ENERGY CONSUMPTION, FAN CONTROL, AND ALL ELECTRICAL CONNECTIONS. CHECK HEAT EXCHANGER AND HIGH LIMIT CONTROL.