The lower door seal was bad and needed to be replaced. Just to be safe I also replaced the door gasket though that piece seemed to be in good condition. Removing the door to replace the lower seal took some time but it wasn't too difficult. There are videos on YouTube but none were exactly like the Bosch unit I had so some steps didn't apply. For example, one video had you undo the water, electrical, and drain connections. None of this needed to be done in my case. Took about 40 minutes being really slow and careful.