cd multichange help required.

[scared but happy]

750il 1st generation car 'N' 1996
I have found one of the plastic cogs have got shreaded by
trying to eject the cd holder.
Does anyone know the pinouts/codes sent to the unit? I could then create my own MP3 cd player.

or where I can order this simple part from? - it looks like some pioneer? unit.
Or perhaps one of you has a spare (hint,hint).