As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 4688 - WHILE ON CLIMB-OUT, THE CARGO COMPARTMENT SMOKE DETECTOR WARNING ILLUMINATED. CREW FOLLOWED CHECK LIST AND DISCHARGED EXTINGUISHER BOTTLES. AIRCRAFT RETURNED TO JFK AND LANDED WITHOUT INCIDENT. MX FOUND SMOKE DETECTOR HAD FAILED CAUSING FALSE WARNING. BOTH DETECTORS WERE REPLACED AND AIRCRAFT RETURNED TO SERVICE. (M)