If you did not save a copy of the 2018 tax return before amending the return, then the original Form 1040 is no longer available when using the TurboTax online editions.
Go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript
For a fee of $50 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf
