As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEADING EDGE SLAT DISAGREE MESSAGE AND LIGHT DURING CLIMB. RESET FLAP/SLAT ELECTRONIC UNIT (FSEU) BUT FAILURE OCCURRED AGAIN WHEN FLAPS MOVED. AIRCRAFT RETURNED TO FIELD. LEADING EDGE SLAT ROTARY ACTUATOR FAILED CAUSING THE EICAS MESSAGE. REPLACED ROTARY ACTUATOR AND RETURNED AIRCRAFT TO SERVICE.