Door membranes a very likely possible, theyre critical to keeping water out.
If theyre ok, id be looking for perished or missing bungs in the engine bay on the firewall area, door seals possibly, leaky screen rubber etc.
Best way ive found is to have someone inside and spray each corner in turn and watch for drips etc.
Did a peugeot once and the body drains in each side were chock full of leaves causing the collected water (must have been a gallon or two) to go down the fan air intake for compartment...
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