The Moeller nitrogen shield would not fill. It appeared to have a flow problem. We went into the hall and discovered the right Q2 N2 valve failed open. The failed valve limited the flow of N2 to the rest of the Hall (especially the Moeller). We closed and de-cabled the RQ2 N2 valve. The Moeller N2 shield has cooled down and filled. We will troubleshoot the Q2 valve during the next opening.