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If some buttons work and others don't, you just have a touchpad that is failing. Now the problem is that the touchpad is part number Y712598 and it hasn't been made for almost 10 years now. You can't refurbish the old touchpanel so you're only hope of fixing the oven would be to keep searching some place like Ebay until one showed up. Sometimes these obsolete parts will show up every couple of weeks. Other than that all you can do is replace the entire oven.
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