location
the fiber optic source is behind the climate control panel on the back wall of that compartment. you can see the little wagon wheel with (on my 88 560SL) 4 little tubes heading out. I don't think that my antenna and defrost switches illuminate, but i can check. the buld that feeds that source is a pigtail off the climate control lighting loop. that bulb can pop loose. fairly easy to access.
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