That was due to corrosion and if you're talking about the 737 that had the top of the fuselage peeled away in flight - it was an Aloha 737 and NOT a Southwest 737. There was even a TV movie made about it.uhhhhh - one tiny screw.
the wrong screw in the fuse of that southwest a few years ago?
top part peeled away part of the top like it was a can opener.
but - in the screw loose, I think you're right.