As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE GOT A SMOKE LAV SMOKE. IT CAME ON BRIEFLY TWICE. COMPLIED WITH ECAM & QRH FA'S INDICATED THAT THE LAV INVOLVED WAS BY THE 3L DOOR (LAV 203). THEY FOUND NO INDICATION OF FIRE OR SMOKE IN LAV. ALSO CHECKED OTHER LAVS. PASSENGER SUSPECTED VAPING. T/S PER A321 TSM 26-17-00-810-804. ALL TESTS PASS. NO FAULTS PRESENT. CLEANED SMOKE DETECTOR OF DUST. OK FOR SERVICE.