If I have the same set up, and not sure I do…you have a manual valve below the control box that is cable connected to the valve in the bilge. The valve control plate just unscrews from the boat and can be wiggled out of its hole. From there you can see if the control lever has failed or the cable has broken loose. If both look fine, have someone move the control lever while you observe in the bilge. If the lever moves and the cable in the bilge does not, then the cable has failed. You can also disconnect the cable from the valve, manually close it, and fill the livewell. See if it holds water in the closed position and drains in the other.Parts are usually available from BCB.