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 FLIGHT LAVATORY SMOKE LIGHT, MASTER CAUTION WITH OVERHEAD ILLUMINATED. QRH PROCEDURE RAN, FLIGHT ATTENDANTS FOUND NO EVIDENCE OF FIRE OR SMOKE IN ANY LAVATORY. LIGHTS EXTINQUISHED AFTER SEVERAL SECONDS. MAINTENANCE PERFORMED SATISFACTORY OPERATIONAL CHECK PER MM 26-14-00.