mine leaked form that area.... the rot was down in the little side wing wall directly behind the passenger door. Found it when I noticed the metal trim along the bottom edge of that wall.
Removed the snaps in the upholstery on that wall on the inside...just inside my house door, to reveal a few screws. That upholstered panel comes right off to reveal the wall itself. Found some rot there. Not to alarm you, hopefully yours isn't...but It was a bugger of a mess, and I'm sure it had been leaking the day it left the factory
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