Ian W;
As emphasized I'm not a software or any kind of engineer but I flew these aircraft for over three decades, so I wade into such discussions with trepidation with what little I comprehend regarding specifics in terms of software, inter-relatedness, architectures and switching.
This ack'd, I doubt very much whether it is that simple or direct. In fact, I consult routinely with several AMMs and know that it isn't that direct. Neither is it conclusively impossible for two reasons: a) proving a negative is not conclusive and, b) even AMMs are limited to NTK.
Rather than go another round I will let this rest and see what others have to contribute and how this unfolds. Many thanks once again per your exchanges.
PJ2