As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ORD DUE TO LEFT ENGINE OVERHEAT DETECTOR LIGHT ILLUMINATED IN BOTH A AND B POSITIONS. FLIGHT LANDED SAFELY AT ORD WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED LEFT ENGINE UPPER FAN DETECTOR ASSEMBLY PER AMM 26-11-01. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.