Found online how to test for issue removed upper back panel with nut driver tested heating elements, temp sensor and controller came down to controller for oven, ordered part standard delivery was at my home in a day and a half WOW, unplugged from wall removed all electrical connectors to controller 4 screws then removed the touch pad from the old controller reinstalled pad on new controller then reinstalled controller and back panel plugged back in to wall. HERE IS THE KICKER IT WORKS BETTER AND HEATS UP FASTER EVEN WHEN IT WAS NEW. It must have had an issue from the factory but took eight years for the board to die. Old part also did not display temp while heating up new one does. With testing and install it took 45 min to an hour. heats up in 10 min in past 20-25