My cd multichanger has recently stopped working. It clicks and whirs, loads and unloads cds from the cartridge but then I get an error message on the head unit. I'm guessing that it's a dirty laser failing to read the disc. Is there a quick and easy fix? It's not desperate in that I still have the single slot cd in the head unit and I have a Bluetooth connection. It's just that I'm quite pedantic and want anything fitted to the car to work even if it's never used.