What was found
ON SHORT FINAL APPROACH, NOTICED A FLICKER OF THE FIRE INDICATION ON NR 1 ITT GAUGE, NO EICAS MESSAGE LIGHTS OR WARNING BELLS. FLICKER REOCCURED AT ENGINE IDLE/LOW POWER ABOUT ONCE EVEERY 20 SECONDS. THE EICAS ENGINE 1 FIRE LATCHED ENGINE WITH ASSOCIATED WARNING BELL, BUT NO LIGHT IN THE "T" HANDLE. WARNING BELL QUIT AFTER 2 SECONDS. NO OTHER VISUAL INDICATIONS FROM ENGINE. NO INFLIGHT SHUTDOWN OCCURRED AND SHUTDOWN WAS NORMAL, NO QRH PROCEDURE. AFTER SHUTDOWN REVIEWED CMC CURRENT LEGS MAINTENANCE MESSAGES WITH MECHANIC SHOWED ENGINE 1 FIRE (2) WITH NO CORRELATIONS FAULT NAME OR OTHER TYPE OF CODE, NO LRU AT FAULT. 30 MINUTES LATER WITH ENGINES STILL OFF, RECHECKED PAGE AND SHOWED ENGINE 1 FIRE (3) AND ENGINE 2 FIRES (1). STILL NO CORRELATION OR CODES RELATED TO EITHER ENGINE. PERFORMED DETAILED VISUAL INSPECTION OF ENGINE 1 FIRE LOOPS FOR INTEGRITY AND DEFECTS IAW AMM 26-11-00 NO DESCREPANCIES IAW FIM 26-11-00-810-807-A. NO CORRELATED FAULTS FOUND. R & R GENERIC I/O MODULE IAW AMM 31-41-06.