As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER FORWARD CARGO FIRE LIGHT AND BELL ILLUMINATED IN FLIGHT DIVERTED TO BNA. PERFORMED OPS CHECK ON CDU, INDICATED FALSE ALARM S/N M13198. VISUALLY CHECKED LOWER BELLY. TRANSFER TO DMI 4771. MEL 26-19-1 CAT B. SWAPPED SENSOR FROM P-3 TO FWD CARGO FOR TROUBLE SHOOTING, R/R SMOKE DETECTOR IN FWD PIT, REPROGRAMMED CDU, OPS CK GOOD IAW B727 MM 26-17-00. THIS ACTION CLEARS DMI 4771. PLACARDS REMOVED. (STATUS:SUPP/CLOSED)