I might be able to add more later if I'm able to ask the right people and bring it up. But first, like you implied, it must have not been anything to worry about. Pretty sure the pilots would have heard the noise and acted accordingly. Did they get back up after talking with the pilots over the phone?

There was one flight where after take-off from DEN-MKE we had to turn around right away because the pilots said that there was an engine indication light that turned on that they didn't like. However, there were no rushing/wind noises coming from the engine. They made sure to announce it to the cabin soon after they noticed the problem.


...I thought this post was going to be about the hydraulic pumps equaling each other out when the plane is on the ground.