As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 1 ENGINE FIRE DETECTION FAULT LIGHT AT B POSITION ILLUMINATED INTERMITTENTLY WHILE IN FLIGHT. TROUBLESHOOTING THE NR 1 ENGINE FIRE DETECTION SYSTEM FOUND R147 TEAT RELAY FAULTY. THE R147 RELAY WAS REMOVED AND REPLACED. THE NR 1 ENGINE B FIRE DETECTION LOOP WAS REMOVED AND REPLACED AS A PRECAUTIONARY MEASURE.