What was found
FLT#888, LAX-BOS. (ETOPS) ENG 1 FIRE LOOP B FAULT ( ENGINE FIRE DETECTION SYSTEMS 2) LOOP B ). PER TSM 26-12-00-810-804-A TESTED ENG 1 LOOP B. NO FAULTS. FDU #1 REPLACED, SEE LP 3868170-1. NO TRAX HISTORY (2 MONTH). NO FAULTS IN AVIATAR SINCE 11/4/23. MDDR CLEARED, MX-4 UPDATED, PLACARD REMOVED. ER GROUND VERIFICATION PASSED.