2ND CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR HEATING UNIT. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, FAN CONTROL, ENERGY CONSUMPTION, HEAT EXCHANGER, HIGH LIMIT CONTROL, AND ALL ELECTRICAL CONNECTIONS, CLEAN AND CHECK BURNERS AND BURNER OPERATION, CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS, ADJUST BLOWER COMPONENTS.