Over the past two years, PHH Corp. has lost $64 million on its mortgage business and now that Merrill Lynch has given notice that it wants to end some of its private-label contracts with PHH Mortgage, the nonbank’s future is beginning to look cloudier. Moreover, analysts and investors who follow the company wonder whether PHH’s private-label model – the bread and butter of its origination business – is fixable in the modern era of mortgage banking. Meanwhile, all of this is happening at a time when management hopes to sell the company, or at least field offers for some of its key assets, including a $226 billion servicing portfolio. The bad news for PHH started...