As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2397 - IN CRUISE FLIGHT, MOMENTARY FIRE DETECTION MASTER CAUTION FOLLOWED BY A FAULT "B" ON NR 1 ENGINE. BOTH WENT BACK OUT IN LESS THEN 2 SECONDS. MAINTENANCE FOUND NO FIRE EVIDENCE. CLEANED PINS TO CONNECTOR AND REPLACED THE FIRE CONTROL AMP. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.