As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2291. FLIGHT CREW REPORTED LAV SMOKE INDICATION ON EICAS DURING CLIMB. CREW PERFORMED AIR RETURN AND LANDED UNEVENTFULLY. MX FOUND V-BAND COUPLING AND METAL GASKET SEALING ELEMENT MISSING ON LT COMPRESSOR TUBE. MX REPLACED GASKET AND V-BAND COUPLING AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. AIRCRAFT WAS APPROVED TO RETURN TO SERVICE.