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Formula for recalculation of a bad loan, i.e. where payments were missed?
It sounds like there are no provisions in the loan document for how to proceed in this case.   I would view this as creating a brand new loan. The amount owed is going to be (Principal remaining + interest from 2 years + penalties).  If you created a new loan for 13 years, that would not be how I would expect a lender to behave. I would expect most repayment plans to be something like make double payments until you are caught up or pay an extra $1000 per month until caught up and then resume normal payments.