searched google and here, no results show. looking for best way to replace it. Kind of got left the chore, have a replacement from nimble tech but the instructions look weak.. as I look in the back there is a power supply and larger casing below that with fans and nic. it has a large handle, with a locking *****. I suppose one pulls the power, pulls the controller, suppose all the way out, locate usb, replace, put controller back in, plug in.. now, tech mentioned something to the effect, "lightly press the power button, to start up the controller (which is the standby one), but not too hard or you will power off the unit". He did not mention if some configuration is lost doing this or not.