KUDS22, huh?
I found a copy of the owner's manual, for models KUDS22OT and KUDS22HT, dated 1989. No explanation about the different model names, mine is an 'OT1'. BTW, KitchenAid's website has PDFs of manuals for the KUDS line and who knows how far back.
You'll like the story of how I acquired my KitchenAid - when I started shopping for a new dishwasher, a friend had rescued this one (as is, including the black panel) from the curbside. Probably tossed out during a kitchen remodel. No repair or refurbishing needed. I'm trying to get the benefactor to participate in the website, he's interested in old appliances, old cars, old kitch, retro in general, and has rescued and repaired several dishwashers and clothes dryers.