It is a wild guess but does the CAS communicate with the CID (CCC screen) somehow or even directly via K-CAN? Because I have Android unit and remember that one plug was left unhooked and recently I removed the unit to inspect the K-CAN wire behind it and it made me an impression that there is a K-CAN wire on that plug which was hooked to the old CCC screen but there was no place to hook it to the Android unit.
Still, as I remember I did not had the D907 fault when I first installed the Android, it started popping out later on.