I looked carefully at the rack itself and discovered what the problem was. I needed a new adjuster because a couple of the wheels on my rack had broken off. I used the Appliance Parts Pros website to locate the parts needed to make the repair. Once I found the Adjuster repair kit, I double-checked to verify for myself the part I was planning to order actually would fit my model using the handy verification portion of the Appliance Parts Pros website to do so. I really like that part of the website.
The part arrived in record time. I was disappointed to open the box and find that directions for installation were not included. So, I went back to the web and was fortunate to find an excellent independent site that explained the steps necessary to make the repair. Check out on YouTube- Dishwasher Rack Hardware Replacement Adjuster Kit Installation by Phil Crocket. Phil did an excellent job of explaining how to replace the adjuster. The most difficult part for me was figuring out how to remove the old adjuster from my rack.
I installed the new adjuster and the dishwasher works fine. I do wish that I had ordered new end clips to install on the rails. I did reinstall the old clips, but having new clips would have been a good thing to do at the same time. I also ordered and replaced a tine row pivot on the top rack that broke some time ago. That part simply snapped in place.