What was found
AT FL 320 NR 2 ENGINE HAD INTERMITTENT FIRE WARNING. COMPLETED PHASE 1 OF ENGINE FIRE CHECKLIST, NO INDICATION OF FIRE, COMPLETED CHECKLIST. CHECKED BOTH LOOP A AND B. FIRE BOTTLE WAS NOT DISCHARGED. PLACED FIRE DETECTION LOOP A ON NR 2 ENGINE ON MEL 26-2-3, DMI 22502 CAT C, PLACARDS INSTALLED. LOOP-B OK. REF DMI 22544, NR 2 ENGINE INDICATED FIRE. A/C ENGINE NOT BURNING, LOOP-A. REMOVED AND REPLACED LT CORE FIRE LOOP ASSY AS PER MM 26-10-1. PERFORMED OPS CHECK AS PER MM 26-10-0. OPS CHECKED OK. THIS CLEARS DMI 22544. PLACARD REMOVED.