20 year old Kitchenaid dishwasher was working fine until today. Only the Cancel/Drain button works and the washer goes into drain cycle. Powered off for 10 minutes and same scenario. Opened the door. Fuse is good and the door latch is fine. Manually latched and power goes to the control board. No appearant signs of burnt wires. Tried a "reset procedure" via "High temp" and "Energy Saver" sequence and still nothing. I do not see available circuit boards for this model, unless I'm mislead. Anything else I can try before headed to the appliance store? Thank you