Redwood Trust is getting ready to issue its third jumbo non-agency MBS of the year, a slightly smaller deal backed by loans with slightly less shelf life. Fitch Ratings said it would give a triple-A rating to the most senior class based on 7.30 percent credit enhancement. That’s slightly above the 7.15 percent enhancement supporting the top tranche in Redwood’s previous jumbo deal. The company’s first securitization of 2012 had 8.25 percent of credit support for the top class, but it included a significant number of adjustable-rate mortgages. The new transaction, Sequoia Mortgage Trust 2012-3, will be backed by all...