There may be a manual somewhere by aftermarket places. As far as factory, there is no definititive "repair manual". Best shot is to pay for a subscription to Startek
STAR TekInfo
Or you likely could find online info for that job. Either here or benzworld.org or maybe even a video on youtube.
EDIT here is one on youtube:
http://www.youtube.com/watch?v=I3OAiyX3mnM