As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PSC- DURING CRUISE HAD MASTER WARNING CHECK FIRE DETECTOR AND NR 2 FAULT B LIGHTS ILLUMINATED. AFTER 15-20 SECONDS LIGHT WENT OUT. REMOVED AND REPLACED LOOP B ENGINE FIRE OVERHEAT SENSING ELEMENT. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.