As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE EICAS MESSAGE DURING CLIMB OUT THROUGH 12,000 FT SMOKE ALARM DID SOUND. INSP LAV NO EVIDENCE OF SMOKE OR ODOR. PERFORMED ENGINE, APU & PACK RUN W/CREW, NO DEFECTS NOTED. DETERMINED TO BE LAV SMOKE DETECTION SYSTEM. DEFERRED LAV SMOKE DET SYSTEM. NO ASSOCIATED CMC MESSAGES. M PROCEDURES C/W. REMOVED AND REPLACED LAV SMOKE DETECTOR IAW AMM 26-14-01-000-801 AND 26-14-01-400-801 OPS CHECK GOOD MEL RESTORED. LAV SMOKE DETECTOR P/N AML 4195403-1 S/N FTA719-01.