on my maytag mah5500bwq I have replaced the control board (not cheap) because the temp control keys and the rinse and spin keys would beep three times but would not light. With the new board all but the hot/cold temp keys work, beeps three times will not light, and the rinse and spin keys beep three times but do not work. All other keys seem to be working.
The spin and rinse keys are needed to do some of the diagnostic tests.