Hello, Welcome to the community.
Hate to be the bearer of bad news here, but I'm afraid there isn't a way to recover a deleted checklist from a card. The best thing I can suggest would be to see if you can find any email notifications referencing the checklist items and recreate it based off that.
While the ability to recover a deleted checklist isn’t currently available in Trello, you aren’t alone in wanting this as we have had other users interested in this as well. With that in mind, I’ve added you as a “+1” to our existing suggestion, which you can access here: TRELLO-352
I have also added this ticket as an internal comment to this report so that way our engineering team can reference to it and also use it to help align priority. I would also recommend you to visit that suggestion, log in with your Atlassian account, and click Start watching this issue on the right panel. This will help our product and engineering team understand more about which functionalities our users are interested in. Also, when the ticket is updated by our product team, you'll be notified via email.
You can learn more about this by reading our Implementation of New Features Policy: New Features Policy.
If you have any questions about this suggestion, any additional information you would like to share, or any comments on our new features policy, please let us know!
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