I just got a big repair estimate (about $500) for my KitchenAid dishwasher. It seems a couple of olive pits got into the works, which, being largely plastic, wete destroyed. The field-replaceable-unit is the whole power unit, not just the impeller. This is not really a defect — I don't expect that it should digest olive pits, and didn't put them in thete intentionally — but I am a little surprised that an olive pit could get into a place where it could do so much damage.
I like it otherwise, so am repairing it rather than replacing it. I'll be more careful from now on.