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Hi,Welcome to Just Answer, My name is XXXXX XXXXX forward to helping you today.
these control panels tend to fail because of steam getting into them, we see this a lot, unfortunately the only way to fix it is replace the control panel,
Manufacturer Number W10254834
here a link to one site that has it, in stock, http://www.repairclinic.com/PartDetail/Touchpad-and-Control-Panel/W10254834/1549639?modelNumber=MDB4709AWB0 you can use the part # XXXXX and see if you can find a better price if you wish however. thanks Bryan