As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE WARNING INTERMITTENTLY ILLUMINATED IN FLIGHT. LAVATORIES CHECKED. NO SMOKE. DO NOT KNOW WHAT LAVATORY. MAINTENANCE ACCOMPLISHED A BITE CHECK OF THE SMOKE DETECTOR CONTROL UNIT (SDCU) WITH NO FAULTS NOTED.