As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5966, CLE TO DCA - THE FLIGHT CREW REPORTED A LAV SMOKE WARNING ON LANDING. CREW REPORTED THERE WAS NO VISIBLE SMOKE OR ODOR, INDICATION ONLY. MAINTENANCE PERFORMED THE LAVATORY SMOKE DETECTOR ADJUSTMENT/TEST IAW AMM 26-14-00 WITH NO DEFECTS NOTED. THE ENGINES WERE ALSO RUN WITH NO FURTHER DEFECTS NOTED.