As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - AT FL 310, 1 HOUR IN TO FLIGHT "ENGINE FIRE LOOP B FAULT" TRIGGERED FOR 3 SECONDS. PERFORMED TROUBLESHOOTING OF ENG FIRE LOOP B FAULT PER TSM 26-12-00. PERFORMED OPS TEST OF OVERHEAT DETECTION SYSTEM PER 26-12-00-710-002-A. OPS CHECK GOOD. OK FOR SVC.