As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL390, THE NR 4 ENGINE FLAMED OUT. THE AIRCRAFT DESCENDED TO FL330 AND THE ENGINE WAS RESTARTED PER COM. THE AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE ENGINE PER FIM, WITH NO DISCREPANCIES NOTED. THE ENGINE FUEL FILTER WAS REPLACED AND THE SUBSEQUENT ENGINE RUN WAS NORMAL.