As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY, MAIN DECK CARGO & "CARGO FIRE" EICAS MESSAGE ILLUMINATED IN FLIGHT. PERFORMED NNC AND RETURNED TO MIA. PERFORMED TROUBLESHOOTING AND FOUND FIRE/OVERHEAT TEST PANEL CONTAMINATED. REMOVED & REPLACED PANEL IAW AMM 26-11-01, TESTED NORMAL.