Redwood Trust is set to issue its fourth non-agency jumbo mortgage-backed security of the year, according to presale reports released this week. The $313.22 million non-agency jumbo MBS includes only slight changes to improve on securities previously issued by the real estate investment trust. Sequoia Mortgage Trust 2012-4 is set to receive triple-A ratings from Fitch Ratings, Kroll Bond Rating Agency and Moody’s Investors Service, with 7.30 percent credit enhancement on the highest-rated ... [Includes one data chart]