As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 340 LVL 3 CABIN SMOKE, CRG FIRE LWR AFT AND CRG FIRE LWR FWD ALL ILUMINATED AT SAME TIME. DECLARED EMERGENCY AND LANDED CDB. ALL SMOKE DETECTORS REMAIN ILLUMINATED. BOTH LWR CARGO FIRE BOTTLES WERE DISCHARGED. REMOVED AND REPLACED MSC, OPS CHECKS GOOD REF AMM 31-42-01-4. ORIG SUB DATE: 11/17/2022