13 POINT TUNE-UP FOR 13YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER. CHECK THERMOSTAT, AIR FILTER, HUMIDIFIER, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, AIRFLOW, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. RENEWED SERVICE AGREEMENT.