As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, GOT A RED LEVEL 3 CARGO SMOKE WARNING AT 18,000. RAN QRH PROCEDURE AND WARNING QUIT, WARNING RETURNED ON SHORT FINAL TO TPA, MEL: ACN RELEASED FOR SERVICE PER MEL/CDL: 26-17-01-03-A CATEGORY: C EXPIRATION: NR 4 MAIN DECK CENTERLINE SMOKE DETECTORS INOP. FOUND NR 4 MAIN DECK SMOKE DETECTOR INTERMITTENT. CAP AND STOW ELECTRICAL CONNECTOR. AS PER MEL. REMOVED AND REPLACED NR 4 MAIN CARGO DECK CENTERLINE SMOKE DETECTOR PER MD10-10 M/M REF 26-15-01-4. OPS CHECK GOOD.