As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LAVATORY SMOKE WARNING SHORTLY AFTER TAKEOFF ON EICAS AND IN GALLEY. NO EVIDENCE OF SMOKE , FIRE, OR SMELL WAS NOTED. MAINTENANCE INSPECTED AND REPLACED THE LAV SMOKE DETECTOR PANEL AND OPERATIOMNAL CHECKS WERE GOOD.