Currently on E-Bay Italy for sale a workshop manual so that is a chance to obtain one. I do have an owners manual, but not with me in Japan so that doesn't help you very much.
As Tubut suggested Tony Stevens from Alfa Stop is the best authority on the Romeo / Romeo2 / Romeo3 topic. He also runs the Romeo register and has a huge collection of manuals on this particular Alfa.
Good luck and best wishes for 2012
Registro Alfasud Giardinetta internazionale (R.A.G.i.)