As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, THE CARGO SMOKE WARNING LIGHT ILLUMINATED. THE CHECK LIST WAS FOLLOWED AND AN EMERGENCY WAS DECLARED. ACFT LANDING WAS UNEVENTFUL. NO SIGNS OF SMOKE IN CARGO BAY. MX INSPECTED THE SMOKE DETECTORS NO DEFECTS NOTED. ENGINE RUNS WERE PERFORMED WITH BLEED AIR SELECTED ON, NO SMOKE NOTICED. SYS OPS CHECKED GOOD. ACFT RETURNED TO SERVICE.