As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT ILLUMINATED & AUTO SHUTDOWN. R & R APU OIL COOLER IAW AMM 49-91-41. OPERATIONS CHECKED GOOD, NO LEAKS. R & R APU ECU DUE TO FAULT HISTORY IAW AMM 49-61-12. OPERATIONS CHECKED GOOD. ROTABLE PARTS CHANGE WAS INDICATED TT 1616520 SN OFF 02300 TT 1603774 SN OFF 01535 COOLER, APU OIL OFF 29-4991-9-0002 2300 & ON 29-4991-9-0002 2431 UNIT, ELECTRONIC OFF 29-4961-9-0002 1535 & ON 29-4961-9-0002 0172.