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Run it again. Put your fingers on the side of the pan and see if you can feel the same pattern as the sound.

The other option would be to use a piece of tubing as a stethescope and listen for the noise in the pan.



I did feel it all over,even put my ear against the pan,can't even pinpoint where it's coming from.

It is a very tinny sound...makes me think very light contact but infuriating.