CLEAN AND CHECK HT. CHECK THERMOSTAT. CHECK GAS PRESSURE AND FOR PROPER VENTING, CHECK BURNERS AND BURNER OPERATION, CHECK HUMIDIFIER, CHECK HIGH LIMIT CONTROL, CHECK AIR FILTER, CHECK ALL ELECTRICAL CONNECTIONS, CHECK HEAT EXCHANGER. ADJUST BLOWER COMPONENTS. LUBRICATE ALL NECESSARY MOVING PARTS. EVERYTHING IS RUNNING GREAT. RENEWED SA.