This tool is used to replace every single character in a WIF private key, and then check if the checksum is correct.
To use this tool you must install Peter Todd's python-bitcoinlib library.
Usage
$ python FixPrivateKey.py <privkey>
You can add --letters LETTERS option to try replacing more than 1 letter.
You can also add --swap to Check if two consecutive letters got misplaced.
And you can add --results RESULTS option to stop trying after more than 1 result.
If you don't succeed or you don't know how many letters you miswrote or if the letters may be swapped, you can try the automatic script:
$ python AutomaticFix.py <privkey>
This will try swapping and replacing up to 5 letters. but it will take a lot of time. Install Peter Todd's library
sudo apt-get install libssl-dev
sudo pip install python-bitcoinlib