Issuance of bonds backed by subprime mortgages fell off a bit during the early part of 2006, but some observers are bracing for an onslaught of activity that could help put the market on track to top last year’s record volume. According to the Inside Mortgage Finance MBS Database, $123.46 billion in new subprime MBS were issued during the first quarter of this year. While that marked a 19.5 percent increase over the same… [Three data tables included]