Checked all connections to main board and all look fine. Camera works but is constantly trying to go up and to the right so much the camera gets hot like 170*F hot. Unit activated and loaded firmware fine.
If you swap the main board you will likely also need to find a DJI shop that will re-flash you Mavic Air to enable the different gimbal to communicate. This goes the other way around as well if you swap out gimbals. Seems to be an effort to prevent DIY repairs..