"They said they were sending a letter or form to change the error"
If you know you are receiving a letter from the IRS, don't do anything until you receive the letter. The IRS letter should contain explicit instructions on what you are to do.
Note that TurboTax would have no way to know that the withholding numbers on your W-2 were wrong.
If indeed the IRS suggests amending your return, you can do this through TurboTax by following the instructions above from katrinaLO.
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