Good news - I've been through the files in my office and I've found one. Bad news - it's in Italian. But of course, if you speak/read Italian, this won't be a problem
You're very welcome to borrow it if you think it'll be helpful.
I'll check at home tonight, as I may have another copy there. Failing that I have a friend with a 1999 Ghibli GT (currently with me) and the correct handbook (in English) is in the leather book pack. While he'll not want to part with it, I could easily look up something for you if you need me to, or photocopy some of the pages, etc.
Feel free to call my office if you want to chat. The number is on the website:
www.coppercoat-superyacht.com