As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2393 - EWR - FLIGHT CREW REPORTED THAT DURING CLIMB OUT, "LAV SMOKE" INDICATION SHOWED ON EICAS AND FLIGHT ATTENDANT SAID SHE COULD SMELL SMOKE IN CABIN/LAV. CREW PERFORMED AIR RETURN AND LANDED WITHOUT INCIDENT. EWR MX RAN BOTH ENGINES WITH BLEEDS ON AND COULD NOT DUPLICATE THE PROBLEM. MX R&R LAV SMOKE DETECTOR AND PERFORMED OPS CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.