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I've flown multiple types of aircraft and do not recall ever having a "high flow" warning on any of them regarding pressurization leaking out, though I will readily admit that I could have forgotten or that it may exist on certain aircraft types. I'll assume the 737 operates like another Boeing I have flown and such a warning doesn't exist. You'll have overpressure warnings and cabin altitude too high (unable to pressurize properly) warnings, but I can almost guarantee that if a door were leaking sufficiently to vent pressurization enough to cause a high cabin altitude warning you would absolutely hear a significant noise coming from the door. Flight attendants are often pretty sharp on aircraft they work on frequently, and any such significant noise would be brought to the attention of the cockpit crew and maintenance. One would hope that such a noise was not present and ignored.
Regarding my musings on over/under pressure...my point was that we don't know what the system warning was and it could be completely unrelated to the door failing or the integrity of the pressure vessel.