Not sure how I stumbled into this one, but here you go. Perhaps not 928-specific enough, but definitely 928 content in there. Reads like a random walk through the Porsche repair manuals. A really random walk.

http://www.williamortel.com/

 

Really random...

If you click on a 928 repair, you go to a list of just 928 repairs - still really random, including some things that are rarely done.