Flagstar Bank is reportedly working on a deal to sell a large chunk of its mortgage servicing rights while retaining a subservicing contract to continue administering the loans. The bank declined to talk about its plans, but during an earnings call this week officials gave more clues that it’s contemplating such a maneuver. They told analysts that Flagstar has taken a close look at how it services mortgages, discovering that it’s quite good at servicing performing loans, but not so good with high-touch product. Sondro DiNello, president and chief executive of the bank, also declared...