How can it be known that the switches were moved physically and not some electrical signal occured on its own (fault) equivalent of switches operated, without actual physical moement of the switch? Some electronic fault in the line of the signal. I do not expect having an independent sensor for this switch monitoring actual physical movements of the switch in parallel of the intended fuel controlling signals occurring, so the faulty signal reaching valves may have been registered and assumed that actual physical movement of the switch caused it?