Hi guys, Ive recently upgraded from a 2002 4.4 to 2007 4.8 and so far it's amazing. however my iDrive "select" button is not working.. I can navigate left, right, up and down but I can not click to select an item. I have taken it apart and cleaned it thoroughly and its not working. Before I buy a new one;

A: does anyone have one for sale?
B: What are the odds the problem could be further down the line? as in the wiring or something..

Thank you!