After you file

@fanfare 

Thanks.  You are correct - there is no change to the tax due.

But your solution involves printing and mailing a hardcopy.  In other discussion forums, it appears there is a way to do this via e-File via TurboTax with an amended return and form 8606.  That would be the preferred way - much easier and saves a few trees.  Is it possible?  If so, could you explain how -