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This is a very well known issue for this model and unfortunately the display board itself has just dimmed out to the point it's un-readable. The entire display board would need to be replaced if you wanted to fix the issue and Jenn Air now has a different company manufacturing the part so that the issue doesn't re-occur. Either way, below is a link to the display board you'd need to order for your model. It's unfortunately about $300 and it's part number.
CLICK HERE for display board
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Not a problem, i assure you it's accurate.