What do you mean when you say you got it resolved? Were you actually 90 days late and you made payments to bring it current? Did you forget to request forbearance and then put the loans in forbearance? If this is misreported, I would think it wouldn't be too hard to fix. But if you really went 90 days late, I don't think there's anything you can do about the fact that it reports as 15 separate loans rather than one loan. You'll probably just have to write GW letters.
Starting Score: ~500 (12/01/2008)