NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the ratings for the student loan revenue bonds issued by Massachusetts Educational Financing Authority (MEFA) Issue I at 'Asf'. The Rating Outlook remains Stable. A full list of rating actions follows at the end of this release. KEY RATING DRIVERS Adequate Collateral Quality: The master trust is currently collateralized by approximately $590 million of private student loans as of March 2015. The loans were originated under MEFA's Private Stu