Water!!!………..Water? How did water get in your Breaker panel? Watch this video and you will see the panel that has water in it has no exposure to the outside or the roof. How did water get In there?
It got in there through condensation. The attic is cold and hot air from the house flows up the conduit and hits the cold air inside the conduit and condensates. Drips into the panel and causes havoc.
The solution? Duck seal ,, ok Duct seal. See how it is applied in this video.