Hello all. I recently purchased a 2008 MC and the **** on the radio (not the volume ****) doesn't respond. Obviously, I am able to listen to the radio, but I can't adjust most of the functions on the unit such as treble, bass, and various other BC features. Has anyone else experienced this? Is there any way to repair it other than a full replacement of the head unit? Or is there any kind of workaround using other controls? Thanks in advance.