Tony -
I don't now anything about a model of the age of yours, except that the walls are most likely framed with wood. And if the wood is wet, it is rotting/rotten. And that is not good. I would suggest that you remove all the screws along the outside bottom edge of the shell, pull off the metal strip, and see what you see inside the wall.
Masonite on the inside is probably the least of the problems - you can pull that off, and either leave it alone or replace it. It is not structural.
Bill
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