HEATING UNIT 12YR OLD. SECOND CLEAN AND CHECK UNDER SERVICE AGREEMENT. ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESSARY MOVING PARTS. CHECK HEAT EXCHANGER, HIGH LIMIT CONTROL, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, FAN CONTROL, ENERGY CONSUMPTION, AND MANIFOLD GAS PRESSURE AND FOR VENTING. RENEWED SERVICE AGREEMENT.