How do you correct a family line in Familysearch that was created from an incorrect marriage record
I recently came across an entire family line with scores of relationships apparently first created in April 2012 from a marriage record for an entirely different couple with similar names in another state. (Of course I don't know what happened before 2012 in this line.) As records have been added, corrections have been made, however the marriage date and place, and the wife's surname still reflect the other couple. As wrong information, merges, or records attract wrong Familysearch hints for possible duplicates and records, the marriage record's correct couple and their family keep popping up as possible duplicates.
So in the case where the people were created from a source that did not belong to them, what is the right way to correct this error? Do I unlink all the incorrect sources and relationships, then merge them with the correct couple, then reconstruct this family with correct parents and sources?