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 INDICATION ON PANEL AT FLIGHT ATTENDANT STATION, "LAVATORY E" MESSAGE DISPLAYED. NO INDICATION OF SMOKE OR FUMES WENT AWAY. MAINTENANCE RESET SDCU PER TSM 24-00-00 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.