Correction, 5/4/12, 9:47 a.m. EDT: The original version of this story incorrectly identified Wells Fargo as one of the four banks to which Dewey & LeBoeuf owes a combined total of $75 million against a $100 million line of credit. The banks in question are Bank of America, Citi Private Bank, HSBC, and JPMorgan Chase & Co. The tenth and eleventh paragraphs of the story have been revised to include the correct information. We regret the error.

In the latest blow to the reeling Dewey & LeBoeuf, the Manhattan District Attorney’s Office has opened an investigation into “allegations of wrongdoing by our former chairman, Steven Davis,” and the firm has tapped two of its own lawyers to lead an internal probe, according to a memo authored by Dewey management and obtained by The Am Law Daily.