I have an 02 Trailblazer LTZ with the bose 6 disc. Ever since I have had it I have noticed a very high pitch whining noise coming through the speakers only when I listen to the radio. It does not happen when I listen to cd's. I read a gm bulletin describing something similar to this and it said to replace the body wiring harness. Before I do spend this kind of money and time, has anyone heard of this?