Maybe done to death..
The only tangible thing we have is the fact there were comms between ATC and A/C AFTER ACARS was registered offline. Satcomm was active.
Now forgive me for asking if it's been repeated but how how much of an alert would this event create on the display CDU?
Lets say ACARS was taken offline due to an electrical short/fire/surge/circuit failure.
We could ascertain at this point VHF radio comms was fine. There wouldn't be too much workload in the cockpit at this time?