Oh I have no doubt the 757 is a great aircraft, and great for us in terms of range, capacity, role etc (hard to find the perfect plane), in fact I've even suggested the replacement for the 757, is a 757 (obviously newer ish..) but Im not sure that would go down too well nowadays with all that has gone on. Agreed there are still a good number of 757 users out there, even amongst military, so I would be interested in their serviceability/operational rates just for comparison if nothing else. I do suspect age (as with anything) is just creeping up on things, unfortunate but inevitable, and not nesscessarily major problems either, but with high air force standards enough to create issue and pull the safety card which is to be expected. We have proven time and time again we can operate aged equipment safely past its LOT but then have to put up with the inevitable "chip lights" when they do occur, still happens in new builds just the frequency of is lessened. I can believe the parts problem plays a, part (pun intended) in all this and obviously they cannot carry a whole host of every spare everywhere they go so overseas breakdowns especially become an issue regardless. We are also probably past the acquiring a 3rd frame (ala the 727s) as a direct source of spares phase at this stage as the replacement debate is well and truely sparked now so would look like a waste of good money after bad to the ever scrutinizing public. I do however like the idea in general (spares frame) as has been shown with the NH90s especially just seems to give us that extra breathing room and instant soloution to cover unforseen issues with less of an impact on the operational fleet and if it comes in under cost of buying everything separately anyway then all the better!
I guess some of it can also be attributed to the type of use as well, ie ad hoc at best, whereas commercial variants are running hot and constant for which they are generally designed so ironically doesnt have time to breakdown haha.
Personally I get it, aircraft have issues and this particular aircraft is just always in the limelight especially when it involves the PM so then seems to gas light the issue (I've been "stranded/delayed" due to RNZAF "problems" that never once made the media). Guess it all comes down to frequency and ongoing/rising costs to see what ultimate fix is implemented as sadly it is becoming a media, and therefore public, bit to bite and everybody does like to bite!