As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3625 - AIRCRAFT RETURNED TO DFW DUE TO ODOR OF SMOKE IN THE CABIN. EMEGENCY WAS DECLARED. AIRCRAFT LANDED SAFELY. REMOVED AND REPLACED SHORTED OUT TRANSFORMER AT SEAT 6CD PSU PANEL. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)