As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE LAV SMOKE CAS MESSAGE FLASHED AND THEN CLEARED. THE CREW CALLED MAINTENANCE CONTROL JUST TO REPORT IT AND WERE INSTRUCTED TO CONTINUE SINCE IT DID NOT REPEAT. FLIGHT 4064 WAS COMPLETED WITH NO FURTHER INCIDENTS.