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Is the loan paid off entirely now or at least paid on time for the past 5 years? If so, the lates will disappear after they're 7 years old or so.
I wouldn't sweat it at all. You could try goodwill letters but student loan companies aren't friendly -- some don't really act human when it comes to debt because of they control the cards and the table. Since it's already 5 years, your scores aren't getting trashed as badly as if it was recent. 2 more years they'll drop off.
Oh yeah, I misread your initial post. Anything 90D or later is considered a "major derogatory" and hurts the entire 7 years. It's similar to what a collection or public record would do.
Thankfully you're only a few years out from that disappearing and your scores will jump massively.
One thing I have noticed is that some banks seem to be relatively forgiving when it comes to student loan debt that has been rehabbed and paid off. I know quite a few people who have nothing negative on their credit reports but old student loan debt, and they all get prime credit cards even with the major hit from years ago. Maybe there are a lot of people with old delinquent accounts that are rehabbed or paid in full now?