What was found
FLT#2220, LHR-JFK. (ETOPS) ' ENG 1 LOOP A FAULT ECAM CAUTION INTERMITTENTLY ILLUMINATES ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); REFER LOG 4067735-1 (REMOVED AND REPLACED ENG # 1 AGB DETECTOR IAW AMM 26-12-17. OPS CHECK NORMAL. NO FAULTS NOTED) #1 ENG AGB A LOOP REPLACED. RAN 1 ENG FOR NEW PFR - PFR REPORTED NO FAULT WITH #1 ENG FIRE DET. SYS. OPER TEST OF #1 ENG FIRE OVHT DET SYS THRU MCDU TEST OKAY REFER AMM 26-12-00. THIS CLEARS MDDR 553144. M/C ADVISED PLACARD REMOVED - MX4 UPDATED.