Hi Theresa! Good for you in using Check. So many people forget to use these utilities!
For the remaining citations that seem to be duplicated, you could do a Search for Individuals Linked to Citations ... IF that is what your case is. (See page 116 of the old manual or 120 of the new manual.) Chances are, these citations are the ones entered in text fields. Use the option to search all fields. The Check.txt file that appears after the Check routine is complete will show the citation number (i.e. 158or 154). In the Individual Text Search window, enter that number preceded by "[CI:" For example: "[CI:158".