Guys,
The drives on my 2007 vessel (w/twin 8.1 OSI-XDPs) were both replaced last season under warrantee ....at about 116 hours. This came just after Volvo discovered that the original "REPLACEMENT" bellows were ineffective at resolving the water ingress issue, at least on some boats in the field. I supposedly am one of the first to have the new and improved/3rd generation bellows on my new XDP drives.
That said, my boat will be pulled sometime in March to change the break-in oil in the new drives (20 hrs.), and to inspect everything......inside the bellows, and otherwise. I'll plan on reporting the findings afterwards.