The fiberoptic leads either go to cluster or behind the a/c control panel, what happened to yours is a lead is probably disconnected from the main source . You will just have to get a light and see where the lead runs. The shifter light is a bulb on its own.

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euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck