MAINT. CHECK-UP FOR 10YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CLEAN AND CHECK THERMOSTAT, AIR FILTER, GAS PRESSURE, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, ENERGY CONSUMPTION, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS.