As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB HAD L/E FLAP ASYMMETRY MSG WHEN FLAP SELECTED TO 1 UNIT POS. AT FL 5K ELECTED TO RETURN TO LAX. ON ARRIVAL FOUND THAT THE NR 1 ENG CORE COWLS HAD OPENED AND PEALED BACK. ALSO FOUND DAMAGE TO THE NR 5 SLAT. ADDITIONAL INFORMATION LATER WHEN MORE IS AVAILABLE. REPLACED LT ENG EXHAUST NOZZLE, CORE COWL, BURNISHED LOWER WING SURFACE INBOARD NR 1 PYLON, REPAIRED WING CLOSURE PANEL.