As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU REPORTS SHOW A RAPID RISE IN CT5ATP TEMP AND HAS SURPASSED THE 605 DEGREE THRESHOLD. (#PRI1/ETOPS) CONTACT ETOPS MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGHT START CAPABILITY, MEL 49-99A IS REQUIRED BEFORE FLIGHT. GROUNDED - YES. REMOVED AND REPLACED ALL APU FUEL NOZZLES REF B737-900 AMM 49-31-14. OPS AND LEAK CHECK GOOD. RAN ENGINES WHILE MONITORING APU EGT, DID NOT EXCEED MORE THAN 550 DEGREES AND IS WITHIN LIMITS.