OK ... I have never personally flown anything with more than two props on it, but ...
EVERYTHING has a breaker and/or a fuse on general aviation aircraft.
I wonder if this was as simple as flipping off the right breaker? The panels are all accessible in flight.
Would need a ‘heavy’ pilot to weigh in here.
Here’s one:
Peter Marosszeky, from the University of New South Wales explained that someone must have intended the power interruption because for power to be interrupted without an entire power failure, someone had only removed power from selected systems on the plane.
“It would have to be a deliberate act of turning power off on certain systems on the aeroplane. The aircraft has so many backup systems. Any form of power interruption is always backed up by another system. The person doing it would have to know what they are doing. It would have to be a deliberate act to hijack or sabotage the aircraft.”