This may be old news for some but may save some of you some time with fixing a noisy finisher issue.
Loose Screws that hold the Main Eject Holders to the Main Eject Shaft.
After screws are retightened.
Only have seen this twice on copiers with counts nearing 1 Million. The noise comes from the finisher, obviously, and is a weird humming vibration noise from the eject holder rubbing up against another shaft.

Thanks for posting this, and a video no less, cool.

Thanks EL. Nice demonstration video. =^..^=