Squeaking Motor Rotor, Bearings Good

Hi,

I've heard a squeak in my direct drive, front load washer. I took it all apart thinking it would be the bearing. When I got the back opened up and took off the motor rotor, I noticed that's when the squeak stops. I checked out the bearing as best I could and it seems fine. There's no rust, nothing seems to be leaking. I can turn the entire drum by hand, with ease when I turn the drum shaft after removing the rotor. There's no grinding in the bearing of squeaking when I turn it. The only squeak is when the rotor is one.

Any ideas what the root of the problem may be?