What was found
ATB VERIFICATION FLIGHT UNSUCCESSFUL. ENG 1 FIRE LOOP A FAULT DURING CLIMB. GROUNDED - YES. ATB ACKNOWLEDGED BY MX. ENG 1 FIRE LOOP A FAULT ACKNOWLEDGED BY MX, OK TO CONTINUE. PERFORMED TROUBLESHOOTING OF ENG 1 FIRE LOOP A FAULT IAW TSM 26-12-00-810-803-A REV 41. CARRIED OUT REPLACEMENT OF ENG 1 PYLON LOOP A (3WD1) IAW AMM 26-12-16-000/400-803, CORE VENT LOOP A (4001WD1) IAW AMM 26-12-17-000/400-803, CORE AGB LOOP A IAW AMM 26-12-17-000/400-802, FDU IAW AMM 26-12-34-000/400-001, ENG 1 FIRE DETECTOR HARNESS ON PYLON (31WD1) IAW AMM 26-12-63-000/400-801. PERFORMED OPC IAW A321 AMM 26-12-00-710-002-A, AMM TASK 26-12-00-710-001-A. TEST SATISFACTORY.