As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POWERPLANT ENGINEERING REPORTS THAT THE APU CT5ATP EGT IS TRENDING TOWARD THE THRESHOLD. REPLACED APU INLET TEMP SENSOR WITH NEW. REF: AMM 49 61 31 & TESTED REF AMM 49 61 00 700 801. ALL TESTS CHECK GOOD. APU ALSO RAN 3 TIMES NO FMC RUN FAULTS.