As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - APU FAULT ICAS AND APU AUTO SHUTDOWN. BITE CHECKED APU ECU AND FOUND "DOOR SYS" FAULT ON ECU. REPLACED RELAYS K547 AND K176 IAW FIM 49-11-00/101 FOR PRECAUTIONARY. R & R APU DOOR ACTUATOR MM 49-15-06 RR APU DOOR OPEN SWITCH IAW MM 49-15-02 OPS CHECK GOOD, OK FOR SERVICE.