Baffled with this sound

I was in the the process of replacing my coolant expansion tank and doing a final inspection for leaks, I had the car running and raised my 4 post lift to look for coolant leaks and I went passed the inspection point for the flywheel and heard a noise. It is real faint because of the exhaust and only audible right next to it.
I looked on the parts diagram and there is a bearing in the flywheel that could be making the noise but I have never heard of anyone having to replace it.
The bearing is around 20 dollars but I'm pretty sure you have to pull the transmission to replace it.

Any thoughts on what you hear or have heard of anyone else who had this issue?