I paid for premier live support last year, how do I talk to a Tax Expert about last-years return? I started this year's return, but don't intend to pay for premier live.

Last years return was already accepted but I believe there might be a mistake that I found doing this years return, and I would like to talk to a tax expert about last year's return (that I paid for last year).  I do not want to pay for premier live this year.  It's nearly impossible to talk to a human at turbotax without it, and they were unable to find a way to connect me.