2ND CHECK-UP FOR 6YR HEATING UNIT. ADJUST BLOWER COMPONENT, AND LUBRICATE ALL NECESSARY MOVING PARTS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK HUMIDIFIER, ENERGY CONSUMPTION, AIRFLOW, GAS PRESSURE, AIR FILTER, THERMOSTAT, HEAT EXCHANGER, HIGH LIMIT CONTROL, HUMIDIFIER, ENERGY CONSUMPTION, AND ALL NECESSARY MOVING PARTS.