As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C YAWED EXCESSIVELY TO THE RIGHT DURING FLIGHT, THE A/C WOULD NOT STAY TRIMMED. AFTER ENGAGING THE AUTOPILOT, THE AUTOPILOT HAD DIFFICULTY MAINTAINING THE FLIGHT CONTROL INPUTS. AIRCRAFT RETURNED TO ATL AFTER T/O. EMERGENCY DECLARED. (AILERON TRIM SYSTEM)