So I can only think that it could be excessive forces and they're reprofiling (which is odd, as you'd think they would just trim it), excessive vibration and they're replacing the track, or they have found problems with the standard of manufacture/construction and are fixing it. Any locals have any better ideas? Was this part of the ride really THAT forceful? Or had any uncomfortable forces? It's all a bit odd to see such drastic maintenance a year after opening.