Please help - trying to find this information is driving me scatty!

My partners A4 2.8 Quattro has had water ingress which had corroded the pins of the CD changer. I have tried to repair but the din lead from the changer which mates to the cars loom is potted and I am unable to trace each wire. Has anyone please got the pin out for the changers sqaure plug to round DIN socket?