As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2260, MAD-BOS. (ETOPS) "ENG 2 LOOP A FAULT ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); PREVIOUS T/S (TROUBLE SHOOTING ON W/O: 1443299 TASKCARD: NR-00002) T/S PER TSM 26-12-00-810-805-A. FOUND PINA/C & A/A OF CORE AGB LOOP A DETECTOR (4002WD1) NULL. R/R CORE AGB LOOP A (4002WD1) IAW AMM 6-12-17. OPS CHK GOOD. MDDR REMAINS OPEN FOR MONITORING) CHANGED LOOP A (4002WD1) AND CHECK GOOD. MCC BOB VERIFIED NO FAULTS SINCE LOOP CHANGE. THIS CLEARS MEL 26-12-01A. MDDR 595440 CLOSED. MX-4 UPDATED. PLACARD REMOVED.