What was found
FLT#841, JFK-DUB. (ETOPS). 'ENG 2 FIRE LOOP A FAULT MESSAGE POPPED UP IN CRUISE AND THEN KEPT ON COMING ON AND OFF AND THEN STAYED ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); FOR CORRECTIVE ACTIONS: REF L/P #3986623-1, REMOVAL AND REPLACEMENT OF FWD FIRE/OVERHEAT DETECTOR (4002WD1), L/P #3986624-1, REMOVAL AND REPLACEMENT OF ENG #2 PYLON RAIL ASSY, WITH LOOPS A+B, L/P# 3986626-1, REMOVAL AND REPLACEMENT OF LOOP A HARNESS (4165KS) WIRES 4033VC AND 4034VC. REF L/P# 3986628-1, ENG #2 FDU TEST PERFORMED. NO FAULTS DETECTED. ALL OPS NORMAL. MDDR CLEARED. MX-4 UPDATED. PLACARD REMOVED.