Get your taxes done using TurboTax

Ok, thanks.   Well, as I said in an edit I just made to my OP, in Turbotax I was able to change the numbers in Column A of the 1040-X by hand, to look the way they should.

 

So are you saying the thing I mail in should just be literally two pieces of paper (plus a voucher and a check): the 1040-X, and the changed Schedule 1 (showing $7000 instead of $11000 on Line 20) ?