When the room is blue form the fountain/hot tub button, there will be 3 buttons that shine in a light blue glow of light.
I found one on a column near the jail, and another by the bed, the 3rd seems to move around between a couple different spots in my experience, one of which was the column near the hot tub, the other spot on the wall near the way you came in, and another time where the 2 girls were sitting on the right when you first came in.