As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FUEL SELECTOR WAS BEING TESTED DURING TAXI WHEN FUEL SELECTOR HANDLE BECAME DISENGAGED FROM FUEL SELECTOR WHEN HANDLE WAS BETWEEN TANK POSITIONS. INVESTIGATION FOUND THE COTTER PIN THAT HOLDS THE SHAFT ASSEMBLY IN THE FUEL SELECTOR BROKEN ALLOWING THE SHAFT TO BE PULLED UP AND DISENGAGED FROM THE FUEL SELECTOR.