If it were me...I would make the necessary changes to the applicantion and have it dated and initialed.
If the changes caused changes to my initial disclosures, I would completed a COC and then re-issue the GFE if fees increased. Otherwise, I would continue on with my original GFE.
Be sure you re-work your eTIL, however, in the event your APR changes and is out of tolerance.
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My opinion only. Not legal advice.
Say you'll haunt me - Stone Sour