Well, ad-astra, it's a simple question. Was there any substance or not? If there was, has it been solved?
I was not aware that this may have been an issue - maybe I'm out of touch.
But the JJ's haven't been in service that long. So, once again, if it's not a problem, a straight-forward 'it's not a problem' would suffice. That is, jets weren't grounded or, if they were, they are no longer being grounded because of this (alleged) problem.
Or, maybe, there was no problem in the first place.