As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2017 - NR 1 ENGINE CHECK FIRE DET MASTER WARNING, ACCOMPLISHED CHECKLIST NR 1 ENGINE LOOP (FAULT B) COMPLETED FLIGHT WITH LOOP A SELECTED, NO OTHER INDICATIONS NOTED. MAINTENANCE DEFERRED AND AIRCRAFT RETURNED TO SERVICE.