Where the wire exits the case, there is a cable gland with a plastic nut. Ensure the black portion of the cable is extends through the nut. If not, you may need to slide the cable slightly in our out of the case. The result should look like the picture below. The black portion of the cable helps ensure a water-tight seal with the nut.

Use your fingers to ensure the nut is tight against the cable.

Find the four case screws and ensure they all still have their O ring. Shut the case and replace all four screws, ensuring they are all fully tightened.