Unfortunately, I think you have to remove the dash 3/4ths of the way to get at the cable. I haven't done the retrofit but I have replaced my HUD after it failed, and even getting basic access to it required removing most of the dash. I was able to leave it partially assembled and just lift and work under it, but for any access you will probably need a rainy weekend and 4-6 hours depending on your skill. It's a terrible design, but hey, German engineering
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