As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"SMOKE TOILET" CAUTION MSG IN FLIGHT. SMOKE SEEN & SMELLED IN MID CABIN. FOLLOWED SMOKE TOILET QRH PROCEDURE. AIRCRAFT RETURNED TO DFW AFTER TO. AIRCRAFT FERRIED TO BTR FOR CORRECTIVE ACTION. MTC REMOVED AND REPLACE RT ENGINE IAW ENGINE CHANGE EC/TC CF34-3. OPS AND LEAK CHECK GOOD AT THIS TIME.