As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO ORD DUE TO NR 2 ENGINE OVERHEATED AND SHUTDOWN. CREW REPORTED NR 2 ENGINE OVERHEAT INDICATION AT CLIMB. CREW SHUT DOWN NR 2 ENGINE PER QRC. PERFORMED TROUBLESHOOTING OF THE OVERHEAT DETECTION SYSTEM. FOUND NR 2 ENGINE CORE DETECTOR M1122, LOOPS A & B WITH LOW RESISTANCE SHORT TO GROUND. REMOVED AND REPLACED OVERHEAT DETECTOR CORE LOOPS A & B. ENGINE OVERHEAT DETECTION SYSTEM TESTED NORMAL.