I guess I was answering this.
"You know, I remember hearing the story about why they re-did the tunnel, but now I forgot. Anyone remember? I think it had something to do with PK's construction.
I too miss the scenes in the tunnel, now it's pretty boring."
As for why a ride is closed, it could be a myriad of things. Low attendance, pump broke, sensor broke... the list goes on and on...