As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU CT5ATP EGT TREND DATA SHOWS EGT HAS SHIFTED ABOVE THE MAINTENANCE THRESHOLD OF 593 WITH A HIGH OF 606 DEGREES RECORDED. ACFT GROUNDED. REMOVED AND REPLACED APU EGT THERMOCOUPLES IAW AMM 49-71-21-000-801 AND AMM 49-71-21-400-801. OPS CHECKED GOOD. REMOVED AND REPLACED APU FUEL NOZZLES IAW AMM 49-31-14-000-801, AND AMM 49-31-14-000-801.