Can't Migrate old Page Hero

Hi guys

First: I have read Moving Hooks & Page Headers to Elements, but it didn't help with this.

On my wife's site I used a nice parallax hero header on the home page, and as far as I can tell the "Page Header" module was deactivated without moving it to Elements. Yet it still works. Now she wants me to make some changes, and I'm stumped.

In Elements, there IS a "Legacy Page Headers" button, yet when I click that the only option is to create a new one, and no apparent way to access the old.

In the back end for that page, under "Layout" there's a dropdown to choose the Page Header, and it shows its name, but afaict there's no way to edit it. And as far as I know, there's no way to delete it. If I'm starting from scratch, oh well, but I want to ensure the old one is completely deactivated so she has no opportunity to enabled it anywhere, since if she does it'll probably be a mess because I'm changing out the photo.

Summary: 1) is it possible to "open" the old hero so I can copy some code out of it? 2) if not, is it possible to delete the old hero so it "can't" ever be reactivated?

Thanks.