As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - AUXILIARY POWER UNIT FAILED AND LEFT ENGINE GENERATOR WAS ON PLACARD. EMERGENCY DECLARED, RETURNED TO LAX WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED AUXILIARY POWER UNIT OIL SENSOR AND NUMBER 1 ENGINE INTEGRATED DRIVE GENERATOR. SYSTEM GROUND CHECK NORMAL OPERATION.