If the check was a gift, you don't need to include it in your income tax return. Gifts are not taxable.
Make this correction (and any others that you need to make), and then re-submit your return.
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***