'71 Sovereign front door is sagging

I'm going through all the things that need fixing on my new '71 Sovereign. The front door is sagging where the hinge is attached to the body. Before I close the door I need to push it toward the back of the trailer to get it square in the opening. Once it's in the opening it fits fine.



Anyone have a picture of how it's held on? It looks like I need to take the galley cabinet out and the interior panels off to get access. I want to know what I'm getting into before I tear into it.



Thanks