Two totally separate issues. Southwest failed to do perscribed inspection on the 737's and were allowed to get away with it by a few at the FAA. Whistleblowers raised the flag on that one.
Delta and American voluntarily reinspected a wire bundle due to a language discrepancy between the service bulletin that gives the instructions and the FAA's interpretation of it. The bulletin called out for tying wires at intervals approximately every 3 inches. The FAA said "not to exceed 3 inches". There was never a safety issue with American and Delta as opposed to Southwest.
Bottom line was that it was a case of the FAA thumping it's chest after being made to look so bad in the Southwest issue...
I stand to be corrected. If the MEDIA in this country would report all the fact, then .... Pet Peeve of mine....I'll shut up.