2ND MAINTENANCE CHECK-UP UNDER SERVICE AGREEMENT FOR 10YR HEATING SYSTEM. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK HEAT EXCHANGER, HIGH LIMIT CONTROL, THERMOSTAT, AIR FILTER, AIRFLOW, FAN CONTROL, ENERGY COMSUMPTION, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS.