As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, APU AUTOSHUT DOWN AT GATE. PERFORMED APU BITE PROCEDURE PER 49-11-00. FOUND HIGH OIL TEMP FAULT. PERFORMED FIM "HIGH OIL TEMP" 49-11-00. REMOVED AND REPLACED OIL COOLER BYPASS VALVE PER 49-27-10. RESERVICED APU. GROUND RUN APU AND LEAK CHECK GOOD.