If it was an electrical issue, they wouldn’t have been able to just turn them back on, which one of the pilots did.
The two switches were moved to off sequentially with the right amount of gap for a human doing it quickly. One of the pilots then questioned why they were off, and they were then both turned back on individually a short time later.
The possibility the FAA was investigating was whether the latches on the switches may not work, allowing them to be moved unintentionally. This was unlikely due to the timing, but they still had to eliminate it.
If it was an electrical issue, they wouldn’t have been able to just turn them back on, which one of the pilots did.
The two switches were moved to off sequentially with the right amount of gap for a human doing it quickly. One of the pilots then questioned why they were off, and they were then both turned back on individually a short time later.
The possibility the FAA was investigating was whether the latches on the switches may not work, allowing them to be moved unintentionally. This was unlikely due to the timing, but they still had to eliminate it.