As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE WARNING LOWER CARGO ACTIVATED AFTER TAKEOFF. DID AIR RETURN TO MKJP. INSPECTED LOWER CARGO COMPARTMENTS FOR EVIDENCE OF FIRE. NO EVIDENCE OF FIRE FOUND. PERFORMED OPERATIONAL TEST OF THE LOWER SMOKE DETECTION SYSTEM. CHECK NORMAL PER THE AM.