What was found
DURING A SCHEDULED 4C MAINTENANCE VISIT, A WIRING ANOMALY WAS DISCOVERED. THE IRREGULARITY PREVENTED THE HYDRAULIC MOTOR GENERATOR OUTPUT FROM BEING SUPPLIED IN PARALLEL WITH THE SHIPS BATTERY DURING GENERATOR USAGE. SIMILAR CONDITIONS WERE FOUND ON AIRCRAFT 5143 AND 5147. IT APPEARS THAT ALL THE AIRCRAFT WERE DELIVERED IN THIS CONDITION. *S/D* CORRECTED WIRING, CHECKS OK. ISSUED EG ITEM TO CHECK ALL ETOPS AIRCRAFT, CHECKED OK.