I think the GS would be the same as a coupe or spyder as far as repairs would go.
I can't remember where I got it, but I have a repair manual that I could send via email if you wish. Just send me a PM with your email address, and I'll be happy to send it!
It appears to be the same information. The only difference seems to be the fact that the "repair manual" is one PDF of 1031 pages versus the 40 or so PDF's. In many ways, the one Catman provided is easier to get to the section you need! Thanks Catman!!