Aural Torture

It's about 80 outside today, so the air conditioning kicked on in my office. There's a vent in the ceiling panel above my head, a few feet over from my cubicle.

Something inside the vent is making a constant chattering-squeaking sound, like a spinning fan that needs oil would sound after sitting dormant for several months.

Occasionally it stops for a moment, but it starts right back up again.

It is slowly, slowly driving me insane...