I didn't, the local auto electricians did and when I got another from SCU, my bodyshop lost that one. Bastards.
Quick tip: take off cover, pierce the surround and cover just enough to loop one of those tiny cable-ties through both, in the same place obviously so the cover can be refitted. Now you can lift the cover for access but not lose it! I did this many, many, years ago, and I'm always amazed how many Murena I see without covers today. People obviously forget to refit them. :-(
Roy