Deephaven Mortgage, a new subprime lender headed by a former Goldman Sachs official, is seeking warehouse lines of credit, according to one banker. The banker, requesting anonymity, said his institution was approached by the North Carolina-based Deephaven in the past few weeks but decided to pass on the credit. The warehouse lender said he believes that, for now, the traditional warehouse community will not extend credit to subprime lenders, even if they have high downpayment requirements and [Incluides two briefs]