I believe some of the 737 aircraft have a small flush antenna housing in that general location (I believe it was black in color). I can't seem to find a picture of it though. I wonder if it came off and caused the rapid D. It looks way too clean of a hole in the top of the fuselage for a hull crack.
Plus, hats off to the crew on a good job getting it down safely.
Just a guess, but it was probably at a skin penetration of the pressure vessel, likely for an add-on antenna of some sort. Post production structural doublers - especially for upper fuselage antennas - are prime locations for corrosion and stress risers to form.
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