I dont buy the 'CC accidently leaning against the swith' theory floating around. The switch has a cover, and takes a decent amount of finger force to get the seat to move. It would be absolutelu obvious to anyone who pushed it that they were the cause of the movement, and they'd let go. No way they just hold it whlist the captain likely shouts about wtf is happening.
My moneys on CM1 being occupied by more than 1 person
