Nicked from the above link
Mine came up with the dreaded "ERR3" message a couple of days ago. There were 2 discs jammed in it that wouldnt come out.
I removed the radio and undid the 2 screws on the back to lift the lid off it.
Once the lid was off i could see that one of the discs had jumped into two of the disc carriers, jamming it solid.
I carefully popped the disc back into its own carrier, and plugged it back into the car.
It all worked fine after that.
I rang my Lexus dealer and the offered to replace it anyway.
Got my new one today ,and fitted it..... sounds bassier than the old one.
(cd @ top model)