Tri-Star troubles
The avionics upgrade will probably be binned now with these ongoing airframe fatigue issues, after a shedload of money spent at Marshalls.
No Sim or training devices are yet available, so all training would need to be carried out on real expensive a/c when not u/s.
Dedicated crews needed for this one Tanker a/c as presumably unable to 'two type' due to many glass/cockpit flightdeck differences with unmodified a/c.
A330 will be coming into service by the time any others upgraded. (two years or so so far on first upgrade a/c, and still not in service.)