As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE DETECTOR LIGHT CAME ON PASSING THRU 14,000 FEET, COPILOT VISUALLY CHECKED LAV NO SMOKE DETECTED. MAINTENANCE CONTACTED AND SYSTEM DEFERRED PER MEL 26-4. SMOKE DETECTOR CANNON PLUG CLEANED AND RESECURED AT RETURN OF FLIGHT DAY. OP CHECK OK.