[Guy]

We also have a 1984 Newell. Every Newell is different, but our coach does not appear to have ever  had any water enter via failed rivets. There has been repair due to window seals failing and clearance markers on the roof needing new gaskets which leaked into the rear closets .  Your coach seems to have had water intrusion around the door. I see that the floor in the picture looks to be more recent than 84. These coaches were built very stout, but many owners installed a/c units and various stuff on the roof, and may not have maintained the sealing materials used. I'm sure others on here have also chased leaks and will chime in. Good luck, you have a great coach to work with.