Hey guys, I'm still new to all this and still learning as I go. We all know that the solar have to remain in service until at least next year (those fitted with the modifications). 

Does anyone have any ideas or suggestions as to what will be ordered for replacement?

I'm guessing it will be gradual replacement with cascades of possible buses already in service. There was just nothing mentioned in other threads so I thought you would be the guys to ask because at least the first order would probably be placed within the next 6 months or so..