© Reuters. FILE PHOTO: A Bank of America building is seen in Los Angeles, California, U.S., May 6, 2019. REUTERS/Lucy Nicholson/File Photo By Jody Godoy (Reuters) -Bond insurer Ambac Financial (NYSE:) Group Inc cannot prove its $2.7 billion case against Bank of America (NYSE:) over troubled mortgage-backed securities on evidence that BofA was a “bad […] More