> This aircraft was logging multiple fail overs of the cabin pressurization system, suggesting the door plug was leaking prior to the event<
That’s only a guess, and doubtful. The noise would have been extremely noticeable.
The way pressurization works - Air is pumped into the cabin at a constant rate by the engines regardless of altitude. The pressure is maintained with outflow values which are nothing more than BIG HOLES IN THE PLANE that are controlled by the system. These holes are bigger than a window.
The pressurization system is very complex with multiple backups and safety features which are constantly monitored. Any single, small fault will generate a “caution” which gets reported. I’m not placing much weight in this reporting.
EC