This story was originally published on Banking Dive. To receive daily news and insights, subscribe to our free daily Banking Dive newsletter. Three weeks ago, executives at Jefferies might have been excused for thinking the lead storyline at the bank’s investor day this coming Thursday would have been details of an enhanced partnership with Sumitomo Mitsui Banking Corp.  That changed last week, when Jefferies disclosed exposure to debt from the bankruptcy of auto parts supplier First Brands.   Jefferies CE ...