As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: JUST AFTER LEVEL OFF FLIGHT CREW REPORTED THAT A RED MASTER WARNING ECAM SMOKE LAVATORY SMOKE DISPLAYED WHICH LASTED 15-20 SECONDS FOR A TOTAL OF 2 TIMES. FLIGHT ATTENDANTS INVESTIGATIONS OF ALL LAVATORIES DISCOVERED NO SMOKE OR FIRE OR FUMES.IN ANY LAVATORY. THE FLIGHT ATTENDANTS REPORTED THE RIGHT REAR LAV SMOKE DETECTOR WAS THE SUSPECTED BAD ACTOR. MAINTENANCE PERFORMED A TEST OF THE LAVATORY DETECTION SYSTEM PER AMM 26-00-00 WITH NO FAULTS / ISSUES NOTED.