My student loan is from Citibank. I was late 150 days 5 yrs ago and it's been haunting me for some time now. I have begged, pleaded, threatened, etc. and nothing has worked. Finally in an act of sheer desperation, I just sent them my story. You can call it a goodwill letter, so to speak. In it, I was honest and told them that I was a stupid kid back then but since then I have done nothing but pay my bills on time. I told them I'm a mother now and want nothing more than to buy a house one day, but that mark they've placed on my credit is keeping this from happening.
I pulled my report on Saturday and show that they are now reporting to TU as Current/Paying as Agreed. AND....they only show 2 yrs of payment history and all are on time. All my past history is now gone. I suppose this is what people mean when they talk about reaging? I didn't ask for it, but it would seem that I got it.

Good luck!