Is it possible to somehow repair the stock CD changer? I had a CDC-635 in my last Saab, and it worked beautifully--never skipped under any conditions. This one skips on every single bump in the road, sometimes stopping for a good 5 seconds. But most importantly, it refuses to play random things. Like it will not play one CD, and won't play select tracks on others. A month ago it did all of them, though.