I've noticed over the past few months that the pump on my X63 rattles. I've found that CAM is causing the pump to act this way. I found this by having CAM run like normal, disconnected and reconnected the USB cable going into the pump - upon reconnection the pump rattle went away completely. However, if you close and reopen CAM after doing this, the noise will start up again immediately. Disconnecting and reconnecting the USB cable seems to cause CAM to lose its connection with the pump control (it won't reconnect until you exit and reopen CAM).