Originally Posted by Diseasel300

Removing the coating is *NOT* recommended. In some cases, it's all that's holding the card together. Your soldering iron will punch right through it for de-soldering and re-soldering. Clean everything afterwards with denatured alcohol or acetone and an old toothbrush. Just how I do it, I've been rebuilding modules and control boards for this era of Mercedes and BMW for over 20 years. My day job is electronics assembly/testing/repair. I speak from experience to save you time and frustration.