Need help w/Engine knock solution

[BC11]

I picked up a 911 C4 with an engine noise that sounded just like a failed IMS bearing.

Began IMS replacement with engine in car.

Pulled IMS bearing.

Old IMS bearing does not look or feel bad.


Here is my question - Do I install new bearing at this point? Or drop engine and look for another source of the noise. I was expecting to see a noticeably bad bearing, one ready to fall apart but this one looks and feels good.

Any ideas?