As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM. ENG 1 LOOP A FAULT ON PDC. PERFORMED TSM 26-12-00-810-851-A. DURING FDU1 TEST, CHECK ENG 1 FIRE LOOP A CORE. RESISTANCE OF 4001WD1 DET-FIRE CORE VENT LOOP A, OUT OF LIMITS. REPLACED LOOP DETECTOR PER AMM 26-12-17. OPS CHECK BITE CHECK OK. NO FAULTS OR ECAM SHOWN.