As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 4 ENGINE FLAMED OUT AT FL 390 DURING MODERATE TURBULENCE. ENGINE RELIT SHORTLY THEREAFTER. ALL PARAMETERS WERE NORMAL. NR 4 ENGINE INTAKE AND TAIL PIPE VISUAL CHECK NORMAL. NO METAL FOUND IAW MM 71-00-00. BORESCOPE IAW MM 72-00-00, NO DAMAGE FOUND. REMOVED AND REPLACED FUEL FILTER PER MM 72-00-00.