I have a Bridgeport Torq-cut 3 (TC-3) with a LOUD Yaskawa uaaska-06dbm12 spindle motor. I think the noise is coming from the top of the spindle motor rather than the gearbox or spindle. It sounds like a bad upper bearing. How hard is it to change the bearings in these motors? Is it easier to split the motor from the gear box on the machine or remove them combined? Aside from the noise the motor works fine. I'd just like to repair it before it causes more damage.