1ST MAINTENANCE TUNE-UP UNDER SERVICE AGREEMENT FOR 12YR HEATING UNIT. REWIRED PURIFIER, OUTDOOR FAN, PULLING MA APS BUT RUNNING WELL. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, ENERGY CONSUMPTION, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS.