As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1511 - EN ROUTE ORD-PSP - 15 MINUTES AFTER TAKEOFF TAIL COMPARTMENT HIGH TEMPERATURE LIGHT ILLUMINATED. FOLLOWED PROCEDURES AND LIGHT EXTINGUISHED WITHIN ONE MINUTE. RETURNED AND LANDED ORD WITHOUT INCIDENT. REPLACED AIR CONDITIONING DUCT. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)