What was found
ELEC ATU L LEFT AUTOTRANSFORMER UNIT FAILURE.DB LEFT 1 GENERATOR CONTROL UNITREMOVED AND REPLACED ATUC-L CONTACTOR REF AMM DMC-B787-A-24-22-05-00A-520A/720A-A. OPS CHECK NORMAL. PERFORMED WIRING CHECKS AS REFERENCED IN FIM TASK DMC-B787-A-24-20-F0-47A-421A-A. NO FAULTS NOTED. REPLACED CONTACTOR STATED IN PREVIOUS ENTRY CURRENTLY NO FAULTS SHOWING ON STATUS PAGE. BUT DUE TO HISTORY OF REPEAT FAULTS OF LEFT ATU TECH SUPPORT RECOMMENDS REPLACEMENT OF LEFT ATU ALSO. R & R LT ATU REF DMC-B787-A-24-25-00-01A-520A-A / DMC-B787-A-24-25-00-01A-720A-A, OPS GOOD.