As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO THE FIELD DUE TO A FLAP ASYMMETRY PROBLEM. THIS EVENT IS CONSIDERED BY ENGINEERING TO BE A ONE-TIME NUISANCE EVENT. THE LE SLAT ASYMMETRY STATUS MESSAGE WAS GENERATED BY THE FLAP/SLAT ELECTRONICS UNIT (FSEU). THE NR 2 FSEU WAS RESET AND ALL OVERLOAD INDICATORS ON THE LE SLAT ACTUATORS WERE CHECKED OK PER AMM 27-81-18. FLAPS WERE OPERATIONALLY CHECKED AND ALL CHECKED NORMAL. THIS IS NO RECENT HISTORY OF LE SLAT ASYMMETRY PROBLEMS LEADING UP TO THIS EVENT AND NO FURTHER OCCURRENCES.