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There are a few steps you can take to try and repair a GitHub repository containing corrupted files with an "inflate returned -3" error message:

1. Clone the repository: Clone the repository onto your local machine using command line or through a GUI tool like GitHub Desktop. This will give you a local copy of the repository to work with.

2. Check for corrupt files: Once you have cloned the repository, you can check if there are any corrupt files by running a command using Git Bash or Terminal. Navigate to the folder containing the cloned repository and run the command git fsck. This will check for any damaged or corrupted files in the repository.

3. Reset the repository: If there are any damaged or corrupted files, you can try to reset the repository to a previous commit using git reset <commit> in the command line. This will move the branch pointer to the specified commit and reset the repository to its state at that commit. Be cautious when using this command, as it will erase any changes made after that commit.

4. Revert changes: If you cannot reset the repository without losing too much work or data, you can try to revert changes made to the repository using git revert <commit> in the command line. This will create a new commit that undoes the changes made in the specified commit.

5. Delete and re-add files: If all else fails, you can try deleting the corrupt files and re-adding them to the repository. This may involve manually re-creating or copying the files from a backup, but it should help eliminate any corruption that may have occurred.

Remember to commit any changes you make to the repository and test it thoroughly to ensure that it is working correctly.