As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 300 FEET ABOVE THE GROUND, DURING LANDING PHASE. RECEIVED AN UNCOMMANDED LEFT AILERON TRIM RUN-A-WAY . TRIM INDICATOR FOR LEFT AILERON RAN CONTINOUSLY TO THE DOWN POSITION. BOTH AUTOPILOT AND YAW DAMPER WERE DISENGAGED SEVERAL MINUTES PRIOR. MAINTENANCE REPLACED TRIM PANEL. OPS CHECKED GOOD IAW SF340MM