As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTOSHUTDOWN ON TAXI OUT. APU CAME UP TO SPEED, GENERATOR CAME ON LINE THEN IT SHUTDOWN. REPLACED APU FLOW SENSING MODULE AND SURGE CONTROL VALVE IAW MM, NO HELP. FOUND BLOWN GASKET ON FLOW SENSOR REPLACE GASKET RUN APU, OPS CHECK GOOD.