Just two days ago my driver side healight became a pink/reddish color signs that the bulb is dying I assume and confirmed by others having the same issue. I found this DIY for those that need it.
http://www.trickykegstands.com/e90Headlight.html
I'm still looking for a good replacement bulb will most likely buy stock though. I replaced the angel eyes a few months back pretty much the same procedure as in the DIY linked above I recommend taking off the tire makes the replacement much easier. Good luck!