Upper Wash Arm fell out

Repair is a piece of cake, much to my relief. The difficult part, if you can call it that, is that when you go to put the small piece in the top that will ultimately hold the Upper Wash Arm in place - don't drop it. Drop it and you are screwed. It goes into the sump area, and you have to disassemble the whole bloody thing to retrieve it, which isn't maybe the easiest thing in the world to figure out. My recommendation would be to 1) remove the top dish rack so you've got a clear shot at it, and 2) cover the sump area with something, anything, that will prevent little bitty pieces that you drop from falling into that sump. Prevent this. Learn from a chump how not to be one yourself.