As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON APPROACH HAD A FLAP/SLAT FAIL MESSAGE. MAINTENANCE REMOVED AND REPLACED NR 4 FLAP ACTUATOR AND FLAP/SLAY POWER DRIVE UNIT WAS REPLACED AS PRECAUTIONARY. COMPLIED WITH OPERATIONAL CHECK OF SYSTEM ALL CHECK WERE GOOD. AIRCRAFT HAD AN OPERATIONAL CHECK FLIGHT AND THE CHECK FLIGHT WAS SATISFACTORY.