As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3829 CREW REPORTED CLIMBING THRU 18000 FEET STRONG SMELL OF SMOKE POSSIBLY ELECTRICAL. CREW ELECTED TO RETURN TO DFW. AIRCRAFT REMOVED FROM SERVICE. GROUND RAN AIRCRAFT FOUND RIGHT RECIRCULATION FAN INOPERATIVE. REMOVED AND REPLACED RIGHT RECIRCULATION FAN IAW 21-24-01, OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.