Timelord - idiocy, yes, but actually now that buying fewer engines than airframes has actually paid dividends. It means that there are a pair of engines that are so new that the problem hasn’t manifested itself and probably won’t until well after the other engines are fixed. Obviously, that was more by luck than design!
My understanding of this module 1 problem is that it affects the majority of modern Hawks. However, it’s an hours based problem and so only the older higher used jets are affected right now. I understand that it is linked to poor quality titanium bought from our old friends the Russkis that sits at the end of the problem (that’s the rumour I heard anyway).