Multiple RGB colors in documents

I am using fm 7.0 - I know this is a very old version however at this point there is no way I can upgrade. I have several documents booked (over 100). Each of these documents are very graphic intensive. When I select Book - find/change - in the find character dialogue box under the color there is every RGB color listed. When this has happened in the past there was 1 document in the book that was causing the problem. That is not the case this time. I have double checked each and every document in the book. They all have the standard colors. I really do not want to have to delete the book and reset it up because that would take LOTS of time with them amount of files that I have, however I am willing to do that if that will solve the problem.