I have all the diagrams but i'm trapped in the fort as i pull the lever but door stays shut and I can't get out.
Any ideas thanks

Hello. Same dang thing is happening to me. Pulled lever to the down position and the Iron Grate (door?) stays shut. Used Aard to try blasting it open with no luck. Used it also all around the room. Used bombs everywhere to try to knock a hole in the wall, no luck. Bug since its also happening to me also?

stu

Edit: Played it thru a second time with no luck. I take it that the 2nd lever reopens the jail door in which you came thru? Returned to that door and it still stays shut.

Can't say i recall the place/quest but if the issue isnt getting the diagram but just getting out once you're done, then you could just install this mod and get out.

http://www.nexusmods.com/witcher3/mods/324/