The 6 CD Changer in my Jag works beautifully when it works. The cartridge itself that houses the actual CD's however, is loose in the player. It seems to not "seat" well and sometimes I get a weird code on the display that matches nothing in the owners manual: "-------H". So so engines if I hit a rough spot in the road just right it either starts or quits. The local car stereo place suggests that if it's the original equipment it may just be worn out? Said I could probably just replace the cartridge. But not sure where or what brand would fit. Help?