They are done tweeking, the movie stars rode the ride.
They are just making sure the system runs smoothly, without any problems and no bugs whatsoever, period.
The ride is fully functional, the ride is easily running at full capacity. With something this complex both in an engineering and programming world, it is a labyritnth of possibilities of what can go wrong. The only way to fix those wrongs is to run the ride non-stop like it would be on a normal park day and have it break down NOW, and not when people are on it.