2ND CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR 3YR HEATING SYSTEM. RENEWED SERVICE AGREEMENT. CHECK HEAT EXCHANGER, HIGH LIMIT CONTROL. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, HUMIDIFIER, ENERGY CONSUMPTION.