The stairwell vent started making a high whistle every morning around dawn.
At first I thought it was coming from outside, but then I stepped into the stairwell and heard it right from the metal cover.
The pitch changed every time the front door opened downstairs.
Delivery drivers, dog walkers, early commuters — everyone triggered a new version of the same noise.
After a few days, someone sent management a video.
Maintenance came by, listened for ten seconds, and tightened one loose corner of the vent cover.
The next morning, the stairwell was finally quiet.
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