Ordered replacement side roller mechanisms, (metal, not plastic), at the suggestion of the APP sales person. The parts were received the next day. I looked at everything and decided to wait awhile. My wife, however, removed and re-assenbled everything. I replaced the rack into the dishwasher: the door would not close. Using a flashlight to look into the rear of the washer, I noticed that the roller track on each side contained a roller that had broken off the old mechanism. I pulled out the rack, removed the broken-off rollers: job done, door now closes.