matrice100 crashed

Hi,
My Matrice 100 crashed today badly, and lost his Motor3 (broken).

Apart from that, his gimbal's carbon rod broke into 2. Later, when I tested it Gimbal seems to be moving as per the instructions. I could see the sensor working. I want to fix that gimbal. Do you have any suggestions of how to glue that carbon rod?

Hi,
Today I got new Arm-M3, and replaced with the old one. I changed the hardware and connected everything back.
However, I hear strange *beep* sound from M3 (similar to the one I heard before!!).

Am I missing some step (may be Calibration) in my steps?