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@JonoMarshall
You can either deal wth this in pre-press by converting all spots to process, but the reason you can't change the colour is because it is being pulled in from a linked file (Illustrator or similar) and needs changing from within that file.
Use the preflight process (file -> preflight) to find which image has a spot in it and then edit that image directly... this will leave you with less unexpected results and happy printers.