As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW CREW REPORTED LT ENG MADE A LOUD THUD & ROLLED BACK TO IDLE WITH ALL INDICATIONS NORMAL FOR IDLE. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LT HAND ENGINE AT DFW ON 11/07/2013. SYSTEM GROUND CHECKED NORMAL OPERATION OPEN.