As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1849 - FSD-SEA - DURING CRUISE, THE NR 3 ENGINE FIRE DETECTION LOOP ILLUMINATED. AIRCRAFT MADE AN UNEVENTFUL LANDING AT SEA. CLEANED CONNECTOR ON NR 3 ENGINE FIRELOOP. OPERATIONALLY CHECKED SYSTEM GOOD. COWL CLOSED AND THE AIRCRAFT WAS RETURNED TO SERVICE. (M)