CLEAN AND CHECK MAINTENANCE TUNE-UP ON A 5YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, HEAT EXCHANGER, HIGH LIMIT CONTROL, GAS PRESSURE, HUMIDIFIER, FAN CONTROL, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. RENEWED SERVICE AGREEMENT.