Squib66, you might be right about the AD . I would say Sikorsky reacted to this swiftly to head off the FAA AD, and if issued most operators should all ready be in compliance with the AD if they carried out the ASB.
The pitch change shaft has a 1250 hour replacement schedule, so many of these have been changed out with no issues. The existing Maintenance procedure is clear enough to me. I imagine with this incident will be a revision in the procedure just like the ASB to check for how much thread is showing past the nut to draw attention to be sure is actually in safety.
As 212 man says a dupe ( duplicate inspection) might have helped to catch this to?