As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. RIGHT AFT B LAVATORY SMOKE DETECTOR WARNING OCCURRED. FLIGHT ATTENDANT CHECKED LAVATORY, NO SMOKE AND WARNING ON ECAM CLEARED ITSELF. FLIGHT ATTENDANTS REPORTED LIGHT INDICATION AT RIGHT AFT LAVATORY. MAINTENANCE ACCOMPLISHED RIGHT AFT LAVATORY SMOKE DETECTION TEST AND PASSED TEST PER AMM 26-17-00.