🚀 go-pugleaf

I am experiencing the strangest thing. I had been using the Heading & Page x-ref format for a very large doc. At some point I decided that I wanted a different format. Rather than creating a new one, I just re-defined Heading & Page to display the desired format (paranum). I made the change and then updated all the files in the book. This seemed to work fine. 

Now here's the really bizarre thing. When I create a pdf from the FM original, the x-refs display a Heading & Page format, DESPITE THE FACT THAT THE FM ORIGINAL LOOKS CORRECT. This sounds impossible to me, but it is happening. 

When I create a new x-ref format and apply it, the resulting pdf looks fine. However, the problem is that I have hundreds of x-refs. How can I perform a find and replace, finding all instances of the Heading & Page x-ref format and then replacing with my new x-ref format, which I've called Issue Number? 

I see no instructions in the documentation for how to find/replace x-ref formats. The help file does say you can find: 

"Any cross-references regardless of their formats, cross-references that use a specific format" 

but it doesn't explain how to find a specific format and replace with another, and the Find and Replace dialog doesn't offer any guidance. 

Thanks.