I think you will have to get an original SAMs issue of the service data.
I believe the company has kept the copyright on anything more recent that 1962. You can get a pre-owned printing of one, but reproductions are not allowed. That's why you won't find any pdfs online.
In other words you can get a copy (like a copy of the newspaper or book), but not a copy (as in reproduction).
You could either go to the official SAMs site or use this one.
http://www.theschematicman.com/hardcopys.htm
EDIT: I thought of something to add.
Quite some time ago when I was first starting to work on vintage TVs I paid for a download from the SAMS site. I think it was for a 1954 set.
The pdf was blurry in spots, I was disappointed. Sometime later I was talking to someone local that also works on TVs and that had had the same thing happen to him. Seems to me when you order a download they have someone just throw their file copy into an automatic scanner. He had contacted them and had them redo the scan. (Why didn't I think of that!) I don't know if you order a hardcopy from them now that they don't just scan the file copy and print that out to ship (charging more).
Moral of the story is; just because it is their info you might not get a good copy from them!