Google e90 radio pixel repair you can also do it yourself
if you are somewhat skilled.
the following threads are somewhat dated but they describe the process.
http://www.e90post.com/forums/showth...ighlight=pixel
http://www.bimmerfest.com/forums/sho...d.php?t=761513
http://www.diyparadise.net/bmw_cd73_repair.html
If you send it in be sure to write down the Serial number so you get the same one back.
You need the same one back to avoid the hassle of reprogramming it.