Morning all,we have a biz c364 that makes horrible noises.We tracked it down to the drive shafts connecting the motors to the toner agitators in the toner hopper it does not turn the gear smoothly causing the shaft to vibrate against the frame.We have changed the toner hopper unit and hoovered it out and checked there was easy movement,and changed the motors.No joy and am stumped as to where to go now apart from a skip.Many thanks for any suggestions. JonPaul