Sadly, the display tube is not available separately, so the only way to fix this is to replace the board, at a whopping $181.48!
One trick that helps is to remove the control panel assembly, take the circuit board out of the frame and very carefully wipe the front of the glass and the rear surface of the control panel frame's display window.
Use a soft cloth with alcohol-based (non-ammonia) window cleaner.
That will brighten it up quite a bit.
At our site, we now have a video available showing how to remove a typical control panel assembly in under 5 minutes.
Be sure to unplug the oven before you do any disassembly.
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