MAINT. ON 10YR HEATING SYSTEM UNDER SERVICE AGREEMENT. CHECK BURNERS AND BURNER OPERATIONS. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, ENERGY CONSUMPTION. HEAT EXCHANGER, HIGH LIMIT CONTROL, HUMIDIFIER, GAS PRESSURE, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS.