As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - CREW REPORTED LEFT ENGINE FAILURE. INVOLUNTARY SHUTDOWN OF LEFT ENGINE (SINGLE ENGINE TIME 38 MINUTES). EMERGENCY DECLARED FLIGHT RETURNED LAX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LEFT ENGINE BUG (BACK UP GENERATOR) TOWER SHAFT SHEARED. CURRENTLY REPLACING LEFT ENGINE AT LAX. SYSTEM GROUND CHECK NORMAL OPERATION.