*Side note on top of the comment I just made..
On the bottom of the doors, where the rubber door stop button goes in the panel, 45 degrees up from the bottom corner, just below the 1" inspection hole, check these, lately I've noticed a ton of 1st-gen and 2nd-Gens where they've started to develop a crack that radiates out and up towards the opening in the panel. It's almost always easy to spot on the driver's doors b/c they see the most use, but can also be caught on the passenger side too. Cut a small v-slice into them with a dremel wheel and drill a 1/32" hole in the end of it and tig it up. Only slightly scuff the weld down, actually if you do it good enough the weld will settle into the v cut. This way it's still gonna be a strong fix.
Give me a few to get a pic for ya if you need better info.