Since there have never been any legal PDFs of any service manuals, probably not. Helm is the only company that produces service manuals for GM. http://www.helminc.com/helm/Result.a...ected%5Fmedia=
Helm does not create PDF versions for the public. PDF versions are sold by people who buy or otherwise acquire the paper version and make illegal copies. Many of these manuals are thousands of pages and the kid who thinks they can make some money copying them underestimates how much effort it takes and make a copy and just thinks the buyer won't notice the difference and, if they do, it is all illegal anyway so who can they complain to.