2ND CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR 4YR HEATING UNIT. HAD TO REMOUNT STAT. RENEWED SERVICE AGREEMENT. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, ENERGY CONSUMPTION, FAN CONTROL, HEAT EXCHANGER, HIGH LIMIT CONTROL, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS.