As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5183 DFW/TXK, PILOT REPORTED THAT DURING PREFLIGHT INSPECTION HE BECAME AWARE OF A SMELL OF SMOKE IN THE CABIN AREA. MAINTENANCE PERSONNEL WERE SUMMONED AND DETERMINED THE PROBLEM TO BE A FAULTY RT COCKPIT RECIRCULATION FAN. THE FAN WAS REPLACED, OPERATIONAL CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RELEASED BACK TO SERVICE.