How do I locate my tax records from 2010?

TurboTax and the IRS only maintain federal tax return for the past 7 years so the 2010 tax return is no longer available.

You should Always save a copy of each tax return every year you file a tax return.

Only an IRS Tax Account Transcript would be available for the 2010 return.

Tax Account Transcript - shows basic data such as return type, marital status, adjusted gross income, taxable income and all payment types. It also shows changes made after you filed your original return. This transcript is available for the current tax year and up to 10 prior years using Get Transcript Online or Form 4506-T. When using Get Transcript by Mail or phone, you're limited to the current tax year and returns processed during the prior three years.

Go to this IRS website for an online transcript - https://www.irs.gov/individuals/get-transcript