Delinquencies on the $347 million jumbo mortgage-backed security Redwood Trust issued in April spiked recently to 3.37 percent. That’s the highest delinquency rate seen on any jumbo MBS issued since 2010. However, Fitch Ratings said the spike was an aberration, caused by a servicing transfer, not sudden poor performance by pristine jumbo borrowers. “Early delinquency related to servicing transfers in recent residential MBS is typically due to ...