Bank of America Corp., after vowing to fight requests that it repurchase certain loans, has begun potential settlement discussions with some of its largest mortgage investors, according to people familiar with the situation… The approach appears to be a major shift in strategy for Chief Executive Officer Brian Moynihan, who in November pledged to engage in "day-to-day, hand-to-hand combat" on investor requests to repurchase flawed mortgages made before the U.S. housing collapse. The investors, some of whom are acting on behalf of clients, sent a letter in October alleging that a Bank of America unit didn't properly service 115 bond deals comprised of residential mortgages. It gave the bank 60 days to respond. The disclosure of the letter sent Bank of America's stock tumbling 4.4% on Oct. 19, as investors grappled with concerns that the bank could be overwhelmed with such investor requests.