This was really hard to find, someone in another forum graciously made this available, just realised, some people here might find it handy.

Haynes don't do one, the only way is to get hold of Alfa Romeo's actual workshop manuals which obviously, they don't give out to the public. I got the previous version which doesn't cover the 3.2 GTA (no probs to me), but this seemed like a crap VB application that just locked up my PC. This one however is the real deal, info for all systems (apart from a few very obscure ones) for all models and all revisions. Also may be usefuls for other Alfa's with the 1.6/1.8/2.0TS,2.0JTS,1.9/2.4JTD, as well as the glorious 2.5 & 3.2 v6's.

The only catch is a couple of insignificant words slipping through the translation. PM me for details, as it would be nice for this source to remain online.