As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE FWD LAV SMOKE DETECTOR WENT OFF JUST AFTER LIFTOFF. CREW INSPECTED LAV AND NO EVIDENCE OF SMOKE-FIRE PRESENT. CREW RESET SMOKE DETECTOR TO SILENCE THE ALARM. REPLACED FWD LAV SMOKE DETECTOR. OPS CHKS OK. NO EVIDENCE OF ANYTHING BURNED OR SMELL OF SMOKE IN LAV.