As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT GOT A "LAV SMOKE " WARNING. MESSAGE EXTINGUISHED AFTER 45 SEC TO 1 MIN. F/A'S CHECKED LAVS, NO SMOKE/FIRE EVIDENT. DID HAVE A PAX EXITING AFT RIGHT LAV THAT SEEMED TO HAVE SPRAYED SOMETHING AEROSOL LIKE. FOUND FLIGHT DECK EFFECT WARNING MESSAGE LAV SMOKE, FAULT NOT ACTIVE. PERFORMED LAV SMOKE DETECTION SYSTEM OPERATIONS TEST CHECKS OK, IAW A220 AMP 26-16-00-01AAA-320A-A. OK FOR SERVICE.