The statute of limitations is also on the IRS ability to ASSESS tax. It's only extended if a substantial amount of income is unreported (25% of gross income). So even if you amend the return, the IRS could not process it.
The instructions for preparing the 2013 amendment would apply to you, where you would copy the file and amend using that. I'm not sure why you are unable to amend a return whether you e-filed or not, because you can even amend a return that you didn't file using TurboTax. What message are you seeing that is not allowing you to amend?
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