In searching your website to diagnose my wall oven's malfunction, I found a control panel with membrane and a control board. I don't know if I should order both of these, or if the control board is all I need. My whirlpool double wall oven, 11 yrs old, has power. The interior light comes on when the door is opened. The display is always black, but if you press start it gives 2 beeps and then immediately 3 more. I hate to order more parts than necessary.