Feel pretty sure this is all related, and incidentally before the camera stopped I noticed some water ingress in the boot.
I think you are answering your own question. Problem at the rear Water getting in on electrics either affecting rev lamps or the camera. Message would relate back to the gearbox when reversing. Working after replacing fuse so probably water.
Auto electrician probably cheaper than Sub dealer but will the former find the leak? You could find the leak yourself, fix and replace the fuse
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