Diploma Text Correction

I've got a diploma with a spelling mistake. It's printed on paper and the text is black. I need a professional who can correct this error without making it obvious that changes were made.

Required Skills:

- Ability to manipulate printed text
- Strong attention to detail
- Prior experience with document restoration or similar jobs

Please ensure you are confident in your skills before placing a bid, I wish for this task to be done flawlessly.