As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI INTO IND, LWR AFT CARGO SMOKE ALARM ACTIVATED WITH AFT SMOKE LIGHT AND ARMED LIGHT. PERFORMED CHECKLIST ITEMS, INCLUDING DISCHARGE OF BOTH BOTTLES. NO OTHER INDICATIONS OF SMOKE OR FIRE; SYS TEST INDICATES FAULT IN AFT SYSTEM. REMOVED AND REPLACED LWR AFT CARGO COMP CEU IAW 26-16-012-2. SYSTEM NOW OPERATES NORMAL.