I called the dealer and he had me disconnect the chain to see if the noise persisted, which it did, isolating the noise to the auger motor and not the auger or burn pot. I brought the motor to the stove shop where he "tested" it which was simply hooking it up to 115v to see if it turned. "Tests fine" was the answer. Pretty convinced the motor was bad I asked for a replacement anyway... "I'll do it for you but I'm telling you that's not the problem". Put the new motor in and the noise is gone.
My theory is the motor seemed fine while holding it in your hand but once bolted into the stove, the vibration resonated and amplified the noise.