The motor actually still gets voltage with the on-off switch in the "off" position and the trembleing is normal, though still somewhat off putting. Contact AR regarding the bearing problem. You said that you conducted the suggested tests but did not say if the turntable was binding in the spin test or, if you experienced excessive rumble. Is there any visual damage to the spindle when removing the sub platter? sometimes, in the ARs the bottom of the platter rubs on the top of the plinth.