As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. AT CRUISE ALTITUDE FL260, RECEIVED ECAM MESSAGE SMOKE LAVATORY, SMOKE RED WARNING, AND MESSAGE CLEARED WITHIN 30 SECONDS. FLIGHT ATTENDANT SAID IT WAS LAVATORY D. THEY CHECKED THE LAVATORY AND WASTE RECEPTICAL WITH NO EVIDENCE OF SMOKE OR FIRE. MAINTENANCE ACCOMPLISHED CIDS RESET OPERATIONAL CHECK NORMAL PER TSM 23-73-00.