As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAKE-OFF, THE PILOT PRESSED THE AILERON TRIM SWITCH TO THE LEFT. WHEN HE RELEASED THE SWITCH, THE AILERON CONTROL YOKE STARTED FEELING HEAVY. CREW LOOKED AT THE AILERON TRIM AND NOTICED THAT THE TRIM WAS HEADING FULL LEFT, EVEN WHEN THE SWITCH WAS RELEASED.