@Davenport
First picture shows the companionway cover. Retake the picture of the area so I can see how the main halyard runs down the deck up into the mast without the cover. Make sure the jaws of the main halyard rope clutch are still holding firm. If not holding fast, replace rope clutch. Suggest after use, the main halyard shackle is attached to the stanchion base Starboard side aft of the mast and pulled tight thru the rope clutch to keep the halyard from slapping the mast.
Do you have roller furling? If no, then secure the jib halyard on the port side after use like the main halyard to keep it from slapping the mast too!
The electrical line will either have a three or four prong deck plug. There should be a corresponding deck plug too depending on year. Photo please. Is there a plastic tube inside the mast on the backside?
The third picture was hazy. Retake it. Is it a hole in the mast and if so, how wide and where is it from the bottom of the mast. Is this an inspection port on the side of the mast?
Please advise asap and notify me when it is done!