Hi, I need helping getting into a barred off area in Avanchnzel. I've entered the door to the Avanchnzel Boilery and walked across the grating with a Dwarven Spider trapped underneath it. Then I came across the room with the ghosts of the adventures talking about something (the room before the one with the spinning blade trap). In that room it looks like there's a barred entrance to get under the grating I mentioned. Does anyone know how to open the bars? I can't find a lever anywhere.