Last resort is sending it to me. I only charge $15 to test/evaluate. I have a test drone AND test P3Adv cam, so I can test the gimbal separate from your main board and vice-versa. I also have many extra screws for free. In one of your photos it looked like the roll motor shaft, sticking thru the circuit board, (with the flat on it), was not horizontal to the roll bracket. May be the photo angle??? I have been repairing DJI cams for 9 years and have become intimately familiar with these buggers. Drop me a PM.