Got back my 2005 X5 from the dealer 2 weeks ago... bunch of parts replaced... brakes etc... All mechanical parts though.

Right away, I noticed that a few pixels on the stereo read-out were dead (there were 2 dead pixels prior.. now there seem to be 10-12). Also, this morning, the buttons on the steering wheel to change the FM channels stopped working.

What could be wrong? Is this something the dealer could have done?