Subprime servicers continue to increase modifications on ARMs, according to a new survey by Moody’s Investors Service. And the American Securitization Forum last week expanded its teaser-freeze loan modification program. Moody’s found that the prereset modification rate on subprime ARMs increased significantly in the fourth quarter of 2007 and first quarter of 2008 to an average of 3.7 percent... {Includes one chart]