This is the response I received from PMDG tech support:
"With each PMDG product, we include a comprehensive tutorial that will teach you how to operate the airplane as is typically done by a modern flight crew. In the past we have had the opportunity to provide actual technical manuals in addition to the operational tutorial. We are currently negotiating to renew our license for this additional information and hope to be able to do so again in the near future. Many users may find various manuals freely available through many sites on the internet."
I then clarified with support that the manuals are no longer provided with the product - at least not until the licensing is sorted out. They're going to have to change their name if they can't get it sorted, it was pretty disappointing.
Anyone got any links to the 'freely available manuals' alluded to above?