You can't amend the Schedule K-1 forms separately. Prepare your amended return in TurboTax Business, and print and mail the Form 1065X with an attached statement that you are correcting only the partner type on the Schedule K-1, and attach only the amended K-1 copies to the Form 1065X and explanation statement.
And, the partners should keep a copy of the amended K-1 with the correct partner type for their records.
See this link to the "What to attach" section of the IRS Instructions for Form 1065X.
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