As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED APU OVERTEMP WHILE ON APPROACH TO TYS. CREW LANDED IN TYS WITHOUT FURTHER INCIDENT. MAINTENANCE TROUBLESHOT APU, REMOVED AND REPLACED APU THERMOCOUPLE AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.