As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, WAS PRESENTED WITH EICAS MESSAGE 27 90 14 00 LE SLAT ASYM, WHICH FORCED THE CREW TO RETURN THE AIRCRAFT TO DEPARTURE. AFTER THE RETURN OF THE AIRCRAFT, CARRIED OUT IN THE FIM TASK 27-81 FAULT TREE 809. THE CLEANING IS PERFORMED AND THE SENSOR S303 OF LE SLAT # 9 INBD IS SECURED. OPERATIONAL TEST IS PERFORMED WITH SATISFACTORY RESULT. THE AIRCRAFT IS RETURNED TO A SERVICE WITHOUT FAILURES LATER.