What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING ENGINES START, THE MESSAGES IN EICAS AND STATUS WERE SHOWN OF CABIN AIR CPRSR L2, RAM FAN PRIMARY L, HYD PUMP DEM R WERE SHOWN WITH MESSAGE CORRELATIONED P700 SOFT START RELAY MODULE CLOSED. MAINTENANCE PERSONNEL PERFORMED REVISION DETECTING ELECTRICAL FAILURE AND ATRU L2 LIGHT TURNED ON AND WIRING DAMAGED. THE WIRING DAMAGED WAS DETECTED AND REPAIRED IAW WDM 24-41-31, TESTED CORRECT. AT MEX, AS A PRECAUTIONARY ACTION, THE L2 ATRUC AND L2 ATRUC CONTACTOR WERE REPLACED IAW AMM DMC-B787-A-24-35-00-00A-520A-A / 720A-A AND AMM DMC-B787-A-24-22-04-00A-520A-A / 720A-A, TESTED CORRECTED.