No, if correcting the outstanding principal balance does not change your refund or tax-due amounts, you do not need to amend your tax return. TurboTax asks for that amount in Box 2 because the amount of mortgage interest you can deduct is limited. But if your outstanding mortgage balances are not more than $750K, the average mortgage balance calculation is not used. It sounds as if you already started amending to repair the numbers - and already know that correcting the box 2 amount does change your tax position.
Do I really need to amend my return?
Mortgage Interest Deduction Limitations
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