I picked up the Trasok's Wrinkled Riddle quest, and I think I hit a bug. When I went to ask about the furnace, he just told me he couldn't work since yesterday, then didn't say anything since. I can't get him to say anything about a riddle or anything further about the furnace, and I can't discard it to restart since it can only be done once. Is there anything I can do to restart it? I tried the same phrase that did get him to respond the first time, and he doesn't respond to it now.