As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CREW PRE-FLIGHT, CARGO FIRE DETECTION LIGHT B5 ILLUMINATED YELLOW. STAYS YELLOW DURING FIRE TEST. WAS NOT (YELLOW). ILLUMINATED DURING GROUND TEST. MAINTENANCE REMOVED AND REPLACED CARGO LOWER 5B SMOKE DETECTOR ASSY PER AMM 26-16-01. OPS CHECK OK. A/C REMAINS ETOPS 180. A/C RETURNED TO SERVICE.