After you file

Critter, I'm not pointing fingers here.  I'm simply trying to figure out what I have to do in order to get through the process to satisfy what the IRS needs.  I did attempt an amend using TT.  In the 1040X, line 16 has 0, line 18 has 3,387, and line 19 has -3,387.  There are no other data in the 1040X.  So what I'm trying to understand is 1. Is the 1040X correct.  2. What other paperwork must I send with the 1040X to the IRS.  Do I need to do anything in terms of amending my state tax for 2019 as well.  I'm an expert at something things but not at tax preparation so I'm simply trying to get the support I need to put this interesting (but scary) situation behind me.  Thanks for your clarification on the accuracy guarantee.  Dan