As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE WARNING WENT OFF, IT THEN WENT OUT ON ITS OWN, RAN QRH PULLED M21 CB. F/A NOTES NO SMELL FROM LAV OR LAV TRASH, NO SMOKE SEEN. REMOVED AND REPLACED LAV SMOKE DETECTOR PER AMM 26-13-10-4. OPS CHECKS GOOD, PN ON AND OFF 72-111211-000 SN OFF A1771 SN ON A3013.