Re: "What are you trying to change?"
Not that this is relevant to the original question, but in this particular case, I want to change the state of the "Someone can claim: You as a dependent" checkbox.
The original question about e-filing a 1040-X is not specific to the change I just described, however. I don't mind a bit of insight on the dependent issue, but that's a separate question / discussion - let's not get too far off-topic (although I guess I opened the door in the side comment - "measly checkbox" - in my previous post. Mea culpa).
