Thor Motor Coach will electronically send diagrams of any current model requested.
The also have reportedly started archives of models since TMC was created from FourWinds, Chateau, Damon, and Mandalay Luxury Coach (2010).
There are archives of some for the Damon's (acquired in 2003 and merged 2010) but not all.
That is where forums like this really help
The standard Owner's Manual is and has been simply a collection of systems manuals and shared with many models having common systems.
Safe travels