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Third brake light not working

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Third brake light is not working on my -08 525 XDAT. Changed all the wiring running through the hinges of the rear hatch last year. The LED lamp itself is tested ok, and the noise supressor Z13 is replaced OK. Suspect a wiring fault following me changing the cable bundle last year.

Does anyone have a guide to dropping roof liner in the rear (easier access to wires)?

Does anyone have a good wiring diagram for the third brake light?

Which fuse protects the third brake light?

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