Citigroup's Corbat faces tense analyst questions as he approaches exit

In unusually direct exchanges, analysts pressed Chief Executive Mike Corbat to explain what management is doing to fix technical and operational problems that have plagued Citigroup for years and led the bank to erroneously send $900 million of its own funds to Revlon creditors in August.Last month, Citigroup announced that Corbat would retire earlier than expected, to be replaced in February by Jane Fraser."Where is the sense of urgency?" Wells Fargo analyst Mike Mayo asked Corbat.