As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE CARGO SMOKE WARNING LIGHT CAME ON. EXECUTED SMOKE/FIRE CHECK LIST AND VISUAL INSPECTION REVEALED NO EVIDENCE OF SMOKE. ON DESCENT WARNING LIGHT WENT OUT. INSPECTION REVEALED NR 3 SMOKE DETECTOR DEFECTIVE. REPLACED SMOKE DETECTOR. SYSTEM CHECKED NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)