I imagine most users are like me and click on "view new posts" option and, at least, open each topic to see if there is anything to interest them, not because we have something useful to add.
Given the design of the car it is difficult to break the rear light cluster without damaging the adjacent body panel - so most users with the problem will probably have had theirs replaced by a bodyshop. However, having done this on other cars, it is usually a simple job once you have removed the panel in the boot behind it - that might be tricky! Also a new cluster will be bloody expensive, as it will almost certainly be a complete unit not separate lens etc.