As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE APU SHUT DOWN WHILE EN ROUTE TO EWR. A RESTART ATTEMPT WAS UNSUCCESSFUL. THE APU COMBUSTOR UNIT AND IGNITION EXCITER WERE REMOVED AND REPLACED. THE APU WAS OPERATED SEVERAL TIMES AND LEAK AND OPERATIONAL CHECKS WERE GOOD. PART TOTAL CYCLES, 5,593.