As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE CAUTION LIGHT ILLUMINATED ON S/O PANEL AND CHIMES IN PAX CABIN. NO FIRE WAS LOCATED AND SYSTEM WAS DEACTIVATED BY PULLING CIRCUIT BREAKER. FOUND LEFT AFT LAV SMOKE DETECTOR WOULD NOT TEST AFTER RESETTING C/B. CLEANED CONNECTIONS AT CANNON PLUG AND SWITCH, OPS CKS GOOD. INSPECTED PLACARDS, EXTINGUISHERS, NO INDICATION OF EXCESS HEAT OR FIRE.