As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - LEFT ENGINE OVER TEMPERATURE INDICATION AND SEVERAL WARNINGS DISPLAYED. EMERGENCY DECLARED, RETURNED TO JFK WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED FAULTY LEFT ENGINE INDICATION AND CREW ALERTING SYSTEM (EICAS). SYSTEM GROUND CHECK NORMAL OPERATION.