As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON FINAL APPROACH RECEIVED 2 SMOKE LAVATORY WARNINGS AND AGAIN ON GROUND. MAINTENANCE INSPECTED LAVATORY A DETECTOR AND PERFORMED BITE TEST OF SMOKE DETECTION SYSTEM ALONG WITH A LAVATORY SMOKE DETECTOR TEST WITH NO FAULTS BEING NOTED.