I have had to replace them on other vehicles that I have owned, and when it gets below 25 degrees, like this morning.........mine squeals a little. So I will get to changing it this spring unless it gets worse.I've never had one fail on me so I keep forget about that little idler pulley. You're right; it could easily be a pulley bearing.
whats the link to your youtube video?I've got the same squeaking noise on mine on startup and the first few revs. I changed the belt out yesterday, but that didn't work. I'm replacing both idlers tomorrow when the parts from in from Carquest.