To be doubtful is always good. It's still a big upgrade package for these birds. What is the middle ages of these birds ? 14 years or so ?Yeah nvm, I went and found some frontal pictures and determined that I was being stupid.
Would be so interesting to know the number of flighthours of these airframes. If they are doing that kind of upgrades, they are clearly hoping to make them fly for the next 10 years.