The following link explains step-by-step how to replace the bellow if its leaking:
If the bellow has simply come loose from the tub facing and/or the door facing, you may just be able to reattach it and save you the cost of replacing it. The link provided will give you the steps to do this. You also need to check all the dispenser hoses that pentrate the bellow to make sure they are installed correctly. If any of the dispenser hoses have pushed behind the rubber, or have cracks in them, you will have a leak that may appear to be the bellow, but isn't. Inspect the bellow by pulling back the rubber folds and check the perimeter.
If the bellow is torn, you will need to replace it. If the model number you posted this question under is correct, the part number for a new bellow is 8182119. Some other parts you may consider are the rear bellow clamp that connects the bellow to the tub facing (part number 8182210) and the front bellow clamp that connects the bellow to the door facing (part number 8182211). If your existing clamps are still in good shape, they can be reused.
If parts are required, you can purchase them at any of the following websites:
If you have questions about this repair, or need additional assistance please let me know. I hope this helps you.