As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2431 SMOKE AFT LAVATORY WARNING MESSAGE CAME ON AFTER TAKEOFF AND REMAINED ON FOR 1.5 MINUTES. FLIGHT ATTENDANT THOUGHT SHE COULD DETECT AN ODOR. GROUND RAN AIRCRAFT AT HIGH POWER WITH NO FURTHER WARNINGS. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.