A report from Defense News. It states that a root cause of the June engine failure has been identified and a deal has been struck for the modification, as well as costings for LRIP 7:
Pentagon, Pratt Cut Deal for F-35 Engines, Modifications | Defense News | defensenews.com
It isn't clear to me from this article how (if) P&W are shouldering some of the cost. It's possible the funding they are to receive includes an offset for their contribution but I can't see that the report actually says that.
LF