I am thinking there is one. I was at the room before the stairs to Lvl 6 where there is a chest behind a door, if I push the button the door starts to open then close.

There is a flame or spark projector in the room but nothing comes out of it.

There is one movable box. I found I had to move the box in front of the projector to block stuff that was not shooting out of it to open the door.

Projector broken?