Racal, PRC-77 schematics needed

I need schematics of PRC-77 from Racal Inc.
I have been searching many sites, but I didn't find what I needed.
Please, inform me if somebody knows where I can get those things.

-THX-

Since this is a military radio that is reparied at the manufacturing location, I suspect that they are the only ones with schematics. The schematics are probably security classified as well.