Batch change color of existing highlights in a PDF (Acrobat X Pro)

I'm trying to find a script or action that will batch change the color of some existing text highlights in a PDF.  The document shows the text being highlighted, but the highlight color is extremely light such that it is visable only with unnecessary effort.  Idealy, I'd like to create a script or action that would identify all of the highlights in the document and change their color to a more standard and visable yellow instead of the washed-out and barely visable yellow I have now.

Thanks!

Edit:  I'm using Acrobat X Pro in Windows.