Performed clean and check on gas furnace found inducer assembly with multiple cracks this must be replaced or repaired checked with trane and found that no replacement parts are available for this furnace. Tested and inspected all electrical components and controls found ignitor near failure with an ohm reading of 96.4. Also noted a minor leak near bottom of draft assembly leading toward the secondary heat exchanger this may be from the vent pipe or a seal behind the collector plate which if removed would have to be replaced. Tested humidifier which is operational. Performed combustion analysis which was normal. Furnace is operating at this time.