I am embarrassed to say that I have put off replacing our bathroom exhaust fan for almost 10 years. The previous one made loud screeching noise, but I was not confident to do it. In the past few days, it bothered me enough to look up YouTube and tried to replace it. To my amazement, replacing the fan motor took 10 minutes. All I had to do was unplugged and popped out the out motor and put the new one in. I am beating myself up for being such a sucker.
Nutone Fan Motor Assembly cost $15.