someone took it upon themselves to board the aircraft and set the rudder trim full left before the flight.
Perhaps even some kids / grand kids / hangar rats were fiddling around in the aircraft whilst in the hangar or someone having a sit in the cockpit. Certainly not out of the question, without knowing the security arrangements there. I’ve found my transponder on an unusual code on the odd occasion.
Read the first two paragraphs of the below link and this appears to be a multi-crew arrangement:
http://www.ntsb.gov/investigations/A...s/AAR1503.aspx