As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE APU HAD A HISTORY OF AUTO SHUTDOWN DURING CLIMB PORTION OF FLIGHT AROUND FL250. THE APU HAD BEEN TEMPORARILY PLACARDED INOPERATIVE. WHILE TROUBLESHOOTING PROBLEM IN EWR, THE APU CENTRIFUGAL SWITCH WAS REMOVED AND REPLACED, LEAK AND OPERATIONAL CHECKS WERE GOOD AND THE PLACARD WAS REMOVED. THE AIRCRAFT HAS FLOWN OVER EIGHT FLIGHTS WITHOUT A REPEAT OF APU PROBLEMS SINCE THIS CORRECTIVE ACTION WAS IMPLEMENTED.