Change the color of in power point

[pacificmac]

Hi I'm new to this and wanted to know of any vba macro to change text from yellow to white in a power point document that's almost 200 pages. Most of the text is white but there are a couple of pages that have yellow text. I tried to do a Find and Replace and change the color there but it doesn't work like Word or Excel. I'm new to this and would like to learn VBA coding in the future as well, so any site references will help.