As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO LAX UNDER AMBER ALERT DUE TO NR 1 ENGINE FLAMEOUT. SUPPLEMENTAL DATA UPDATE: CAUSE WAS FAILURE OF THE H.P.C. ROTOR SPLINE ADAPTER DUE TO OIL STARVATION. ONE OF THE FOUR OIL DRAIN HOLES BLOCKED BY NORMAL SPLINE OPERATION WEAR DEBRIS. UAL MAINTAINS AN ISOTOPE INSPECTION OF UNEXPOSED SPLINE ADAPTERS FOR SPLINE WEAR. AT PART LEVEL, UAL INSPECTION CRITERIA FOR SPLINE WEAR IS TIGHTER THAN G. E.'s.