Been trying to track down more than just the one article from the Times, and havent had much luck yet. My understanding is that in typical beauracracy fashion, the J model had teething pains and no one got in a hurry to fix them. It has more powerful engines than the other models, and from what I've read it causes too much stress on the airframe when loaded. Lockheed was trying to find a way to "fix" the ones already delivered without having to scrap the whole thing and replace them. If the Air Force says its fixed, and trusts it to do the job..........well, they are the ones responsible if it falls apart in the air and kills people. I guess if they are willing to back that up, it's probably fixed. You never can tell in these deals between the Miltary and Congress when it comes to appropriations though.