PERFORM CLEAN AND CHECK ON 6YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, AIR FILTER, HIGH LIMIT CONTROL, HEAT EXCHANGER, FAN CONTROL, HUMIDIFIER, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESSARY MOVING PARTS. CHECK GAS PRESSURE AND FOR PROPER VENTING.