I need my brand logo tweaked

I'm looking for a graphic designer to make a small adjustment to an existing logo I already have (specifically, modifying one letter). I also need the font color changed from teal to black, and the amended logo exported in high-resolution JPG and PDF formats. The file is currently in Illustrator format (.ai). This is a straightforward task for someone experienced, but it's time-sensitive—I need it completed by the end of the day tomorrow (UK time).