As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - ENG 2 FIRE LOOP A FAULT. REMOVED AND REPLACED ENG 2 FIRE LOOP A, WNVRN12 (4181KS) PER WDM 71-51-75. PENDING OPS CHECK. OPS CHECK FAILED. FOUND WIRE HARNESS LOOP A ( 31WD2 & 32WD2) SHORTING TO GND. REMOVED & REPLACED 31WD2 & 32WD2 PER AMM 26-12-36. OPERATION CHECK OK PER AMM 26-12-00.