Misd-again, that's an interesting thought. Unusual thing... I initially wondered why a whole aircraft was dispatched instead of just an engineer with a door seal. Then I saw the pictures, and also heard the whole door is now being replaced. At some point I was also wondering if some exceptinally persistent seal issue (maybe a gremlin airframe) could have weakened some structure over time, as a door seal just seemed like a common and likely culprit for the described noises, but I cant possibly know, and of course it could be a totally different cause.