How to reject Guru card changes?

Hi,

I have a user who made changes to a Guru card for which I am the Verifier. In short, the changes made by the user are wrong, and they have virtually re-written the card to be incorrect. I want to use the previous trusted and Verified version of the card, and reject the changes. I do not want to have to rewrite my entire card from scratch!

How can I reject/revert the change to the previous version? Thank you!