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Wouldn't the state of the switches be logged on the flight recorder?
Yes, but it might be very important to determine: did the pilot/copilot flick the switch, or did the switch change state without user input?
Is the crew at fault (training issue/operator error) or is the manufacturer at fault (design flaw) or was the ground crew at fault (improper maintenance)?
A camera could help determine that, if it had the right field of view.
Mechanical switches aren't flipping themselves 4 seconds apart
No, but a short circuit might
it is, mentour pilot released a video about the preliminary report the other day where it's mentioned that the fuel pumps were set back to active with a 4 second delay between flipping each switch.
this link should be set to the time stamp where he goes over what happened with the switches: https://youtu.be/lVS76zcpZok?t=1102