As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION, E/E COOLING SMOKE LIGHT DID NOT LIGHT UP AND NO EICAS MSG DURING TEST. MAINTENANCE REMOVED & REPLACED E/E COOLING SMOKE DETECTOR PER AMM 21-58-19 OPS CK GOOD. A/C REMAIN ETOPS 180 OPS. AIRCRAFT RETURNED TO SERVICE.