You can go to:
https://www.thormotorcoach.com/owners/, create an account, then using your VIN, you can get to many different pieces of information about your particular MH, including plumbing diagrams. If you have a problem there, call Thor Customer Service (1-877-855-2867) and give them the VIN and they will send you the diagram. They have been very helpful to me.
Good luck with the leak!