On November 27, HSBC Bank, acting as trustee for a Real Estate Mortgage Investment Conduit Trust, filed suit against DB Structured Products, Inc., a Deutsche Bank affiliate, in the federal district court for the Southern District of New York.  The complaint alleges that DB Structured Products breached its contractual duties by failing to properly review the mortgage loans underlying an RMBS securitization and by failing to buy back allegedly defective loans.  HSBC, which alleges that over 90 percent of the underlying mortgage loans did not comply with underwriting guidelines, seeks rescissory damages or alternatively compensatory damages, and failing the award of damages, specific performance requiring the repurchase of allegedly defected loans.  Complaint.