Need to Amend 2017 Business Return

[valrory]

While reviewing our Quickbooks reports for the 2018 tax returns, I found that I made an error in 2017 and need to amend the 2017 business (1120S) return.  We did not use TurboTax, but a professional CPA firm.  Is there a way to use TurboTax to amend the return or should I simply find the forms on IRS.gov and fill them in?