The "Live" experts do not help with amending past year tax returns. They only help with current year returns. You can amend your own return and ask specific questions for help from the user forum, though.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
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