As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL COMPARTMENT TEMP HIGH LIGHT ILLUMINATES WITHIN 3-5 MINUTES AFTER PUTTING APU AIR ON. LIGHT GOES OUT 30-60 SEC AFTER TURNING APU AIR OFF. CLEANED TAIL TEMP SENSOR, NO HELP. DEFERRED APU PER MEL 49-1 CAT C. LOG PAGE 5218 - REMOVED AND REPLACED APU EXHAUST DUCT. (M)