I have tried to obtain workshop manuals, and i certainly dont mind paying for it......, My local dealer was even less helpful ......... and i have searched the internet for a decent informative workshop manual to no avail.
You are not alone. My B200 has been here in Canada since the fall of 2005. No manuals available, no info available. period..
They make manuals for many Classes, C.S etc.....and many other higher ends but zip for the actual people who might get a little maintenance done on their cars.
Everything for our B Class is considered "Top Secret" when trying to get anything out of the dealers here in Canada.
Good luck with getting your WIS up and running!!
...there's a ton of good info in it, but be patient in finding where it is.