As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED AFT STAIRWAY DOOR LIGHT FLICKERED IN FLIGHT AND TOWARD THE END CAME ON STEADY. NO BUFFETING AND FUEL BURN NORMAL. EMERGENCY DECLARED LANDED DFW WITHOUT INCIDENT. REPLACED LEFT UPLOCK SWITCH. SYSTEM GROUND CHECK NORMAL OPERATION.