As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RECEIVING A SMOKE DETECT MESSAGE DURING CLIMB. NO SMOKE WAS OBSERVED OR SMELLED, RETURNED TO FIELD, DID NOT DECLARE EMERGENCY. MAINTENANCE PLACED FWD LAV SMOKE DETECTOR ON MEL AND LOCKED OUT LAV IAW EMB AMM 26-41-01. NO DEFECTS NOTED.