As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO4009, CREW REPORTED ON DESCENT INTO EWR, LAV SMOKE INDICATION (CAME ON), NO VISUAL INDICATION OF FIRE OR SMOKE. MAINTENANCE REMOVED AND REPLACED SMOKE DETECTOR PANEL IAW EMB145 MM 26-14-02. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.