As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE DETECTOR AUDIBLE ALERT SOUNDED DURING CLIMB, NO SOURCE OF SMOKE OR OTHER EVIDENCE OF FIRE FOUND. F/A RESET SMOKE DETECTOR. REPLACED FWD LAVATORY SMOKE DETECTOR IAW AMM TASK 26-12-11-000-801 & 400-801. OP'S CHECKED NORMAL IAW AMM TASK T/R 26-050. ACFT OK FOR SERVICE.