I sent my Extreme lab 2 into service at JLC. The one that I have currently is one of the ones that has the black bridges. 
I just heard back from JLC that in order to service the movement, they need to replace the full movement with the new lighter colored movement, as it has been updated. They can’t just service the existing movement.
I know most people prefer the lighter Bridges, but thoughts? I feel like there isn’t really a choice as I’m not confident anyone else can service this watch.