As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY AFT LEFT SMOKE DETECTOR BEGAN SOUNDING DURING LANDING IN DFW. MAINTENANCE ACCOMPLISHED TSM 26-17-00-810-804-A AND FOUND NO FAULTS. REPLACED SMOKE DETECTOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.