I found A board for a KUDS22 Pt# 4171349, that apparently has a bad display also, and it is not interchangeable anyway.
This might be a hard part to find, as mentioned before they were not the popular in the first place nor that reliable, although if you can find a used one you may be able to send it out for rebuilding at a company like Corecentrics.
Rebuilding if possible could cost $200.
John L.