We had the same problem last year. I ended up just breaking it the remove the shore cable, as we were relocating the rig. When we got to our new location, we headed down to the closest CW, and picked up a new receptacle for the rig and a new right angle adapter which is what we had plugged into the receptacle. It turned out to be an overheated terminal that caused the white plastic of the plug to expand which locked the plug into place. When cutting things apart, doing an autopsy of the parts, it was a bad connection in the plug of the right angle adapter that overheated.
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