The dishwashers stopped working without any indication that there was an issue. The cycle type (heavy, normal, light, rinse only) buttons on the left of the latch do not function but the heated dry, hi temp wash etc on the right are working. I checked the thermal fuse and door switches with my multimeter and they are passing a continuity test. When I looked at the ribbon from the LED's to the circuit board I noticed a small dark spot and I am wondering if that could be the issue, and if so, how I could test/fix it. I have attached pics of the cable and the door. I tried looking for a tech info booklet for this and I could not find it (i think the previous owner had the dw apart and lost it). I don't mind replacing the circuit board or the touch pad but I want to be certain of the dx before I spend the money. All LED's light up when I do the field test by pressing high temp wash + heated dry ~ 6x. Any assistance anyone can provide would be greatly appreciated.