I just want to add a couple of comments. These kinds of problems come up all the time, and it's very frustrating.
Is the school's financial aid office really so rigid that they can't just overlook a $65 difference on a $59,000 item? That's a difference of 0.1%. How much of a difference would $65 of income make in your son's financial aid? If you can't easily figure out what the $65 is, maybe you should try to talk to someone higher up in the financial aid office.
If the $65 turns out to be taxable scholarship income (SCH 65 on line 1), you would think that the people at the school would know about that. After all, a lot of college students have scholarships. But we get a lot of questions from people whose college financial aid offices tell them that their tax return is wrong because of scholarship income being added to the wages. There's a surprising amount of ignorance about tax returns among the people in college financial aid offices who review tax returns all the time.
