As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB TO LMT FLIGHT 7675: SHORTLY AFTER TAKEOFF PILOT REPORTED LOSS OF AILERON TRIM CONTROL. PILOT ELECTED TO RETURN TO LMT AND DECLARE AN EMERGENCY. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND SHEARED ROLL PIN IN THE LOWER HORIZONTAL SPROCKET OF THE AILERON TRIM WHEEL ASSEMBLY LOCATED IN THE COCKPIT CENTER PEDESTAL.