Switch positions
Let's put the switch position debate to bed once and for all.
The AAIB are very professional and thorough. If there was the slightest possibility that the switch positions had been changed by an impact with the instrument console, then they would have looked to see if the switch was bent, or witness marks/paint transfer were evident.
There is no conspiracy here on the part of the AAIB or the manufacturer.
If you are told you are low on fuel, you RTB.
If you think there is a defect in a system, you RTB.
If you have been flying a 135 for 1:37, at night, over a city, you should be RTB.