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I've come across this problem twice in the last year. Both times it was water that worked it's way into the wire from the meter to the panel. So if it were me, I'd pull the meter from the base to isolate the panel. This is legal in PA without contacting the electrical supplier, but I'm unsure with your state. I would call to confirm with your supplier. Then with the service wire being dead, you can use your meter to ohm out the wire. While your in there, I would also check for signs of water. Just remember the top of the meter stabs are live at all times unless it's disconnected at the service head. If you need more details, just PM me and I'll help you out the best I can. Also In PA, you are responsible for the condition of your electric feed from the supplier's wire connections at the service head. You even own the meter base. They supply the meter, and make the main connections to your house, and that's it. Everything else falls on the homeowner.
Good luck, and be careful
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