Please help! I have worked diligently to determine the source of my leak in my dishwasher. It appears to be a strip of white plastic (about an inch wide) at the bottom of the inside of the dishwasher door. It does not fit the way it should on one side and even makes a snapping sound when the door is opened. Can anyone tell me what part this is??? I can't locate it! Please don't tell me I have to buy the whole door... Thanks!