Inspect the door bellow (seal) for any rips or tears. It may be worn or loose and require replacement. This is a fairly simple repair that anyone can do with a little guidance. The following link explains step-by-step how to install a door bellow on a Whirlpool Duet front loader:http://www.fixya.com/support/r385210-replacing_door_bellow_kenmore_elite
Although the bellow may not have any physical tears, they can also become mishapened over time due to normal wear and not seal properly. You should have a good tight seal all the way around the door.
Read through the link provided and let me know if you have any questions.
NOTE: There is another method you may try as well. Although I do not prefer this next method because these washing machines are very heavy, an alternative way of replacing the door bellow is to remove the lower toe panel and tilt the washer back at a 45 degree angle instead of removing the washer front panel. If you use this method, make sure it rests against the wall and will not tip forward. This allows the wash tub to drop down and away from the front panel and gives you access to the the rear bellow clamp through the bottom. This can save you some time. Thanks to user DGBG for the helpful tip.
If you would like some helpful exploded view diagrams of your washer that you can reference, you can use any of these web sites:
Just use your model number to begin your search criteria.
NOTE: These door seals do wear out and require replacement from time to time. However, overloading the washer to the point where items get caught in the door area can contribute to premature wear and tear.
Some additional items to look for that may cause leaks:
1. Check the dispenser tubes that pentrate the door bellow. Sometimes they get pushed behind the rubber causing the water to trickle behind the bellow and leak. You will notice this on fill and rinse.
2. Check the rear bellow clamp that holds the seal to the front facing of the wash tub. The clamp can come loose, causing it not to seal properly.
3. Check the drain pump and drain hose. If you notice any pooling of water in the cabinet it could be a loose drain hoses or a leaky pump.
4. Check the area under the wash tub. The tub consists of two halves bolted together with a seal in the middle. If the seal is leaking it may need to e replaced. NOTE: This is a labor intensive repair.
5. Check the right hand side of the wash tub for a small air dow hose. Sometimes this hose comes loose and starts leaking. This hose runs to the pressure switch and is what is used to sense the pressure differential in the wash tub. If this hose is leaking, you would have problems with the washer overflowing.