Find and replace all instances of a PMS color
When I first started out on my current project I accidentally used uncoated PMS colors instead of coated. Unfortunately there are a few stragglers left in at least 75 extremely complex Illustrator files, and they are causing "phantom" colors to show up in InDesign. I cannot get rid of them in ID, and I assume they're buried in one of the linked Illustrator .PDFs.
Is there ANY way, within Illustrator, to find specific colors and replace them. For example, find all instances of PMS 154U and replace with PMS154C, 185U for 185C, 165U for 165C, Purple U for Purple, C and so on with all 17 PMS colors. I did manage to fix the vast majority of them last year, but it's the stragglers that are giving me fits in InDesign. In that program, I can find a specific color if it was generated within InDesign, but not if it's embedded in a graphic. Can anybody point me in the right direction? It could be something as simple as an accidentally-generated 1cm-long line that's impossible to see or find without a color finder of some kind.
Please and thanks!
Here's my Swatches panel and there are a few 'U's in there, but how can I find where each one is?

