As I recall (don't remember where I saw it at this point) there were rumors about some issues with the lights in the tunnel that required them to redo the whole lighting in that area, which is why they've been off. It was one of the things they were working on during the last refurb, I believe I saw a complete switch to LEDs, but something caused the work to not be completed which is why they are still off. I assume this refurb is to complete that work, along with whatever else is scheduled.
I would honestly be surprised if Space is closed longer than a week or two.