If you visit Disneyland in SoCal I could let you look at mine.
Don't buy the CD off ebay or other advertised locations, its a copy of the work a guy on rennlist did. If you don't feel his work should be paid for, do a google search for porsche 928 manual, and you should see a site called something like cannel.uk and there also is a bit torrent, both free downloads.
To pay for the work of collecting and scanning all the manuals, talk to Roger at
928's R Us USA and he can ship you a CD or set of CDs.
The 9 volume notebook set is very handy to have, they turn up on ebay, but best to keep an eye out here or rennlist in the classified section. You can also print sections out of the CD, even enlarged prints of things like wiring diagrams, but the notebooks are easiest to browse etc.