Thank you , kindly. Well, it turns out there was a huge mouse nest inside the AVT area.
I mean mouse hair and mud everywhere. The belt looks like it started to break and that was probably the sound I was hearing. I guess I am going to take all that apart and clean it with WD 40. Now, they must have gotten in there through what looks like a plastic tube. where does that plastic tube come from ?
https://drive.google.com/file/d/0B_6...ew?usp=sharing