Select text fill color and replace with a new color... globally?

Hi everyone,

Working on an Illustrator document that contains some 300 words, the text fill color is set to light gray. I designed the piece so that some of the characters are filled with a different fill color in order to make a large shape within the arrangement of words. I made the mistake of not assigning a global color.

Is there a way to select all occurrences of a text fill color, and then replace with a different color, globally? All text is on the same layer.  

Thoughts?