My student loans showed IIB and of course as you know they won't be discharged but rather go on a forebearance for a period of time while your BK is being sorted out. When I called Sallie Mae about mine (federal) they said the forebearance lasted a year from my filing date.
Pulling your credit report doesn't effect your score. I wouldn't pull your reports until a week or so after your discharge so that it has time to hit the public record and any of your baddies that didn't want to remove things will have to do so now(obviously within the law).
I did all my disputing before my discharge and only had two hold outs that I needed to handle post-discharge. I did them all online through the CRAs websites and it was pretty straight forward, most don't need a "letter" in a traditional sense. They ask why you are disputing and you put a concise reason, boom, done. Some people like to do letters/faxes as they don't trust the CRAs to take the appropriate action, but I've had good experiences so far.
Good luck in cleaning up your reports, it will help get the ball rolling towards rebuilding a lot faster!
