[NH_Bulldog]

You should be able to remove the screws on the outside of the housing and then using a putty knife, slowly work around the lip and carefully pry the housing free. The hole is big enough to reach in and pull the cord back out, thread it back through the opening and then reinstall with new putty tape and sealant. Of course now would be the perfect time to get a twist-lock adapter kit and make it a detachable cord and never have to worry about it again!