The adaptive headlight warning is displayed. The protective cover on the back of the headlight assembly has plastic clips and attachment points that are broken and it will no longer attach correctly. This let water into the headlight assembly. Is it possible to just change the headlight housing or will the entire headlight assembly need to be changed? It looks like a headlight assembly is about $1000 so this one part would be about a sixth of the car's value (100k miles). Any guidance on whether to repair the part or trade up to a newer BMW would be appreciated.