Its pretty rare to do work on both lines at the same time when there is any potent risk to integrity of the lines the TP guys that make the decisions...
Just of interest if I upload the 3XV head cover model to Craftcloud 3D, the price delivered for two is around 380 USD. This cost the same amount here...
It's almost funny that a crew of people did such a thing as took out three sets of bolts at once from a tower and left much of northland in a bit of...
If you put a scope on the powerail you probably would witness the power rail being shaken up and down enough to cause issues and a reset but too fast...