(Bloomberg) -- Credit Suisse Group AG leaders are discussing replacing chief risk officer Lara Warner after a string of miscues at the bank led to losses potentially totaling billions of dollars, according to people briefed on the matter.The bank is expected to give investors an update on the impact of its exposure to the collapse of Archegos Capital Management and the fallout for Warner and other top executives this week, said the people, who asked not to be identified describing private plans.