Redwood Trust’s planned $329.95 million jumbo mortgage-backed security is the second straight MBS from the issuer to have adequate geographic diversity, according to Fitch Ratings. Almost every jumbo MBS issued since 2010 has taken a hit from default expectations and had higher credit enhancement because of geographic concentration. Sequoia Mortgage Trust 2014-3 is scheduled to be issued around Sept. 19. Fitch, Kroll Bond Rating Agency and Moody’s Investors Service gave the deal preliminary triple-A ratings with credit enhancement of 6.55 percent on the top-rated tranche. The credit enhancement level is one of the lowest in recent years on jumbo MBS backed by 30-year fixed-rate mortgages. It is particularly low considering that due diligence was completed on less than 100 percent of the loans, and the MBS will include two loans that do not meet standards for qualified mortgages.