As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: SMOKE LAVATORY ECAM AND MASTER WARNING WAS ON FOR APPROXIMATELY 2 SECONDS AND THEN CLEARED. PERSON IN LAVATORY WAS QUESTIONED ABOUT SMOKING OR VAPING. NOTHING WAS EVIDENT OR SMELLED BY FLIGHT ATTENDANTS. NO FURTHER SMOKE INCIDENTS FOR THE FLIGHT. MAINTENANCE INSPECTED MID LAVATORY SMOKE DETECTOR. NO FAULTS FOUND AND ACCOMPLISHED A SATISFACTORY SMOKE DETECTION BITE SYSTEM TEST PER AMM 26-10-00 WITH NO ISSUES NOTED.