Actually, I seem to remember somewhere a discussion about once you've issued the GFE you can't go back and change it even if you are inside the three day window.
Once you issue the revised GFE within the allotted time you cannot "revise the revision" absent another changed circumstance affecting the issued revised GFE.
As a number of us keep saying an employee's foul up due to them not paying attention is not a changed circumstance, other than maybe for their next performance review.