Try ebay
Try a search on ebay. There have been copies of Volvo manuals available on CD in the past couple of months. It's a copy of the original manual, still not the best because of the way it was originally written, but a manual none the less. I also downloaded a service manual a long time ago - I think from beneteau-owners.com but their site seems to be down at the moment so I can't check it out for sure.