recently replaced both inside tail lights; condensation led to LED failure and is not fixable....
They were a bit difficult to remove but after removing the nut (and loosening the plastic part underneath), start lifting the light from the inside (see picture from the previous post, only lift the light a few centimetres) then push the light towards the outside, it will release.

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E70 - 3.0si & F10 - 535ix
Previous Cars:
E34 - 525i, E39 - 530i, E60 - 530i