As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING DESCENT MID LAVATORY. SMOKE LAVATORY SMOKE ECAM WARNING LAST 3 SECONDS. NO SMOKE NOTED. MAINTENANCE PERFORMED BITE TEST OF THE SMOKE DETECTOR FIRE SYSTEM WITH NO FAULTS DETECTED PER AMM 26-10-00-740-801.