Magic_Clean and bigalsf...thank you so much!
My parts arrived yesterday and I installed them, now the dw works perfectNo more washer arm message! Oh my gosh, I cannot thank you enough!
It was totally worth it to purchase the parts. So much better than buying the new junk I saw. I LOVE my dishwasher!
Yep, I am able to bypass the open cup message, but I'm feeling a little brave to try that repair now that I have my feet wet.