I crashed my first P3A and snapped the role bar on the gimbal, so I gave up looking for a replacement and bought a good used P3A. However I tried out the damaged one and it flew perfectly without the camera. So I’m wondering if it would be ok to swap the good gimbal and camera to the damaged drone? I just want to test it to find out if there is any other hidden damage  and then swap it back to the good one. Does anyone know if this would be safe to try?

I am sorry to hear about what happened to your aircraft. In that case, I would highly recommend to send in your unit to our facility for diagnosis and fix the issue. Our repair team will be able to provide you a feedback on it. To start the request you may click on this link: http://www.dji.com/support