Still looking for a solution to a gimbal issue. I have a Phantom4Pro-v1, bought used. The seller said he started it once with the gimbal guard still in place, but it appeared to be working OK. Too late, I noticed that upon start-up, the gimbal does it's normal dance but after it finishes the camera slowly sags downward about 10 degrees from horizontal. The C1 button is programmed for horizontal-vertical gimbal control, and it does move the camera through 90-degrees as it should, but the 90-degree arc starts with the same 10-degree sag, and so finishes at 100-degrees from horizontal; that is, the camera looks slightly backwards. I have replaced the pitch motor; no improvement. What might be the issue ... ribbon cable, control board, other? Thank you.