You're a veritable fount of information Dack! I did have the VC gasket replaced once under warranty, but it looks like either they suck, or the guy who installed it does, because it seems to be leaking again...
A search here doesn't show a DIY for it, and a look at the corresponding diagram on realoem makes it look like a bit of a bear:
http://www.realoem.com/bmw/showparts...68&hg=11&fg=15
Have you done it yet?
ianc