As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW CREW REPORTED LT ENGINE SURGES FOLLOWED BY ENGINE VALVE LIGHT ILLUMINATED. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LT HAND ENGINE AT DFW ON 9/12/2013. SYSTEM GROUND CHECKED NORMAL OPERATION OPEN.