As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG - CREW REPORTED NR 2 ENGINE FIRE WARNING IN FLIGHT. MAINTENANCE INSPECTED THE ENGINE AND FOUND NO INDICATION OF FIRE OR OVERHEAT. FIRE WARNING FOUND TO BE AN INDICATION PROBLEM. TROUBLE SHOT IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL. FOUND INBOARD PIGTAIL AND OUTBOARD AFT PIGTAIL OF FIRE LOOP TO HAVE CORRODED CONNECTIONS. REMOVED AND REPLACED FIRE WARNING LOOP AND CONTROL UNIT. SYSTEM OPERATIONALLY TESTS NORMAL.