Thanks for your response. I sincerely appreciate your efforts. Please let me know which website or tool is the best for checking the checksum and correcting the public address. Thanks.
To fix that address I simply decoded it to hex, calculated the correct checksum, and then re-encoded it in Base58. You could probably use a site like
https://gobittest.appspot.com to do this online if you wanted.
I really don't know why you want to, though. None of this is in any way relevant whatsoever to your private key with the incorrect characters. Have you tried brute forcing it with btcrecover yet as I suggested above? Do you want me to try for you?