What was found
LT ENGINE FIRE LP 2" STATUS MESSAGE. LT ENGINE FIRE LP 2 PC CARD M682. REMOVED AND RESEATED PC CARD, FAULT STILL EXISTS. REMOVED LT ENGINE FIRE LOOP 2 PC CARD AND SWAPPED WITH RT ENGINE FIRE LP 2 PC CARD, IAW B767 AMM 26-10-01. FAULT STILL REMAINS, SWAPPED LT AND RT ENGINE FIRE LP 2 PC CARDS BACK TO ORIG POSITIONS, FAULT REMAINS. OPENED LT ENGINE COWLS. TRANSFERRED TO MDDR 137015, IAW MEL 26-11-01-01, CAT C. REMOVED AND REPLACED AFT UPPER FIRE LOOP ASSEMBLY, IAW AMM 26-11-02. OPERATIONS CHECK GOOD.