Major Vibration while printing (Replicator 2)

[Mouser]

It does not effect print quality, but the vibration is certainly a lot louder than it should be.

Any suggestions?

Thanks

If you can HEAR the vibration then wouldn't that suggest a stepper motor?
All steppers are installed nice and tight? Have you tried touching a stepper motor while its running and see if that might be where it's originating?