As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON DESCENT INTO DFW GOT A CLASS 1 SMOKE LAVATORY WARNING. FLIGHT ATTENDANT SAYS IT CAME FROM MID CABIN LAVATORY AND NO SMOKE NOTICED. WARNINGS EXTINGUISHED 30 SECONDS LATER. ACCOMPLISHED CABIN INTERCOMMUNICATION DATA SYSTEM RESET PER TSM 24-00-00. FAULT CLEARED.