As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SLAT DISAG LEVEL 2 ALERT AFTER SLAT EXTENSION ON APPROACH. INTERMITTENT ALERT FROM FLAPS 28 THROUGH TOUCHDOWN. CALL TO MOCC ON SATCOM INDICATED THAT IT WAS A SENSOR PROBLEM AS REPORTED BY ACFT TELEMETRY. REMOVED AND REPLACED LT NR 4 SLAT POSITION SENSOR A P/N 8-621-02 IAW AMM 27-84-03-4. OPERATIONAL CHECK GOOD. NO SLAT DISAGREE MESSAGES NOTED.