Tokyo Gas Co. said Tuesday that the Mizuho financial group knew it was having problems integrating the computer systems of its three component banks before the April 1 merger.
Tokyo Gas officials said that in late March a test in which data from the utility's large-lot customers were sent to Mizuho's integrated computer system ended in failure.
Mizuho, however, denied that such a test had been conducted, though it admitted to receiving client data from Tokyo Gas in mid-March.
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