As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIRTY MINUTES AFTER TAKEOFF, RECEIVED A LEVEL 3 ALERT, LOWER CARGO FWD FIRE. DISCHARGED FIRE AGENT IAW PHASE 1 PROCEDEURES, RAN RED TABS. DIVERTED, CRASHED. FIRE RESCUE INSPECTED ACFT AND FOUND NO INDICATION OF FIRE. INSPECTED FWD LOWER CARGO BAY FOR ANY INDICATIONS OF FIRE OR SMOKE. NO DISCREPANCIES NOTED. R & R CARGO FIRE CONTROL PANEL IAW MM 26-14-10-4. REPLACED FWD SMOKE DETECTORS IAW MM 26-14-01-4. GROUND OPS CHECKED OK.