What was found
RECEIVED FIRE/OVERHEAT SYS EICAS CAUTION MESSAGE, INTERMITTENT EICAS MESSAGE, FOLLOWED QRH PROCEDURES, RESET SYS FAIL PUSH BUTTON. STATUS MESSAGE INDICATES BOTH LT ENGINE FIRE LOOPS OTS. LT ENGINE LOOP 1 MESSAGE WENT AWAY IN FLIGHT. PERFORMED FIM PROCEDURE 26-11 FAULT TREE 804. LT ENGINE LOOP 1 PASSED, LOOP 2 REMAINS ON MEL 26-11-01-01. SWAPPED FIRE DETECTION CARDS LOOP 1 WITH APU LOOP 1 FOR TROUBLESHOOTING PURPOSES, ITEMS M4 & AMP; M5 FOR SWAP INFO.