CLEAN AND CHECK HT. CHECK THERMOSTAT, CHECK HUMIDIFIER, CHECK BURNES & BURNER OPERATION, CHECK HEAT EXCHANGER, CHECK GAS PRESSURE AND FOR PROPER VENTING, CHECK HIGH LIMIT CONTROL, CHECK ALL ELECTRICAL CONNECTIONS. ADJUST BLOWER MOTORS, LUBRICATE ALL NECESSARY MOVING PARTS. REWIRED FURNACE. EVERYTHING IS RUNNING GREAT. RENEWED SERVICE AGREEMENT.