The computer in cockpit is not foolproof. I can tell that there is at
least one Citation X where the computer simply shut down one engine
and left no trail of diagnostic data behnind, just empty memory.
Obviously you don't normally expect that sort of behavior from a
corporate jet...

They landed with one engine (no pilot overide) and the Cessna engineers
came out and did a lot of head scratching. I do not know what the final
diagnosis was on that one.