It is just one bulb and they do burn out. Gently pull off the center dial and you will see
it. The bulb is lees than $2. To remove to old bulbs I us a piece of 1/4" tubing and get it
firmly on the bulb. Then just remove it.
If nothing else has ceased to function then it is the bulb and not a fuse. Dealers stock them.
They are used in a lot models.
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