As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4614 STL-EWR. CREW REPORTED LAV SMOKE WARNING DURING FLIGHT WITH NO SMELL OR SIGN OF FIRE OR SMOKE. EWR MX REMOVED AND REPLACED LAV SMOKE DETECTOR IAW EMB145XR AMM 26-14-01 AND RAN ENGINES WITH OPERATIONAL CHECKS SUCCESSFUL AND NO SMOKE NOTED. ACFT WAS APPROVED FOR RETURN TO SERVICE.