I had a Phantom 2 with a DJI Zenmuse H3-3D 3 Axis .
i was having trouble with the USB connecting to the Assistant app so I sent it to DJI.
7 Months later I received a email they were replacing the whole Phantom 2.
I didn't send the DJI Zenmuse H3-3D 3 Axis to DJI because it was working fine...