As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 3131, THE CREW REPORTED A LAV SMOKE EICAS MESSAGE EN ROUTE FROM GDL. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE INSPECTED THE AIRCRAFT OPERATIONALLY TESTED THE LAV SMOKE DETECTION SYSTEM ALL WITH NO DEFECTS/EVIDENCE OF SMOKE NOTED. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.