The symptoms of my problem began with dishes not getting very clean. Wasnt really sure if it was my perception or not so I let it go a while. Then I determined the upper sprayer arm wasnt moving (could hear motor running, tub had water in the bottom but opening closing door revealed arm in same position). Shortly after that the dishwasher started making noise.
This is what I have tried:
1. Visit this website and supplementary searches.
2. Remove lower spray arm and the various covers and filters down to the chopper assembly. Found and removed what I have learned from this site is technically termed "gunkus" - calcified labels, plastic stuff, lots of soap calcification. Removed the chopper assembly soaked and cleaned (toothpicked the various calcified holes). Replaced the chopper assembly and everything else.
3. Ran a cycle on HOT WASH with bottle of dishwasher magic.
4. Ran a small dish load everything looked pretty clean but I didnt really have anything that dirty (e.g. no spaghetti, coffee, juice, etc) that would be any challenge.
The upper spray arm is moving and general overall improvement. However the noise remains.
In one post regarding a different mfg/model our sometimes lucid host I think suggested the chopper shaft may have been stripped but I dont know how to check for that short of removing dishwasher and removing motor assembly. When I installed chopper, I turned the impeller by sticking finger down water inlet valve so i am reasonably sure the reinstalled chopper is engaging the impeller. I have no idea if the impeller is moving I guess.
P.S. - I originally thought the dirty dishes were due to malfunctioning soap dispenser but I replaced that with a new dispenser and verified that the door opens.