Well found the common "burn" on the post-facelift bottom bulb. I can fix that.
These appear to use variable voltage for the bottom bulb. Park lamp on, dimly lit - brakes applied - full brightness.
I'm hoping to fix this with splicing in pigtailed sockets like burn victims have used
http://www.xoutpost.com/bmw-sav-foru...t-fix-diy.html