Mr. Lewis, testifying under oath before New York's attorney general in February, told prosecutors that he believed Messrs. Paulson and Bernanke were instructing him to keep silent about deepening financial difficulties at Merrill, the struggling brokerage giant. As part of his testimony, a transcript of which was reviewed by The Wall Street Journal, Mr. Lewis said the government wanted him to keep quiet while the two sides negotiated government funding to help BofA absorb Merrill and its huge losses.