There aren't any. Well, not ones that are any good. The two I have are more like a bunch of random tips a guy put together on a few popular or semi-popular cameras. The diagrams he used are so over-photocopied they are barely legible, and his directions leave out huge swaths of relevant detail. What little camera repair I've done has been from using helpful internet guides.
I think there used to be a camera repair course listed in the back of Pop Photo. Maybe some of the educational material it used is still out there.