Thanks very much for your reply. No, just standard storebought CD's were used. It seems the changer must come out anyway for repair, so I'll give it a try.
My car has a "salvage title" which voids all warranties. A very quirky law in California. In a minor wreck, it had very little damage to the bumper and for whatever reason, the insurance company ended up owning it. A perfect car with less than 20k miles. I must say that I regret owning that "black cloud" on the title, but what car it is!