E36 window drop/raise failed

My car (UK spec E36 coupe) has the problem where the driver's door window
does not drop/raise when opening/closing the door. The window works
otherwise. I suspect the switch.

I took the door card off at the weekend to look inside, but I don't want to
disconnect anything mechanical just in case I can't get it back together -
it's a bit awkward to reach inside. (In particular, the rod connecting the
door handle to the lock mechanism.)

So, please would someone tell me how to get to the switch to clean/replace
it?

(I think it's item 13 in this diagram:
http://www.realoem.com/bmw/showparts.do?model=BF12&mospid=47427&btnr=41_0939&hg=41&fg=40 )

Andrew


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