Fannie Mae this week released a revised prospectus for its single-family MBS program that updates language on non-standard collection options such as biweekly payment plans, certain hybrid ARM pools and loan eligibility. The government-sponsored enterprise also expanded its discussion of representations and warranties provisions affecting its single-family MBS. In addition to requiring sellers to repurchase mortgages that breach the reps and warranties, Fannie said it is important for investors to consider that there are other mandatory and optional cases where loans may be ...