I had the same problem with mine and ended up taking the door apart and rebuilding the frame.
Remove the window and door lock ass., turn the door outside down and remove all weatherstripping and caulking along the edge.
Once you have that done you'll see the outside skin is bent over the inside skin along the edge, carefully bend this up all the way around.
Don't overdue it, you don't want to bend too far and start stress cracking along the bend.
With a little coaxing the inside skin will lift off.
I put a few coats of epoxy on the new frame before ass. and used foil covered foam board as insulation/stifener.
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