Thanks David, I would prefer to not do that right now if I can avoid it. The device was only shipped a little over a week ago if that helps.
Just to explain what I'm trying right now. I've checked out and installed the multi_cam_support branch of depthai-python, and I'm setting the frameSyncMode of the left mono camera to OUTPUT and testing the FSYNC vs. isolated ground on the scope. I'm getting the same result as above.