As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THAT DURING FLAP RETRACTION, THE NR 4 SLAT DID NOT RETRACT FROM 5 TO 2 FLAP SETTINGS, FUEL DUMPING WAS ACCOMPLISHED. LOG PAGE # 36436. REMOVED AND REPLACED THE NR 4 SLAT ACTUATOR ASSEMBLY AND THE SLAT SWITCH, IAW 727 MM REF 27-81-22 AND 27-82-11, OP CHECKED NORMAL.