Stop further water invasion...
Over time the wicked water will go away.
Corrosion is not a killer problem with nearly pure rain water.
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To stop further water invasion use every manner of underground rated epoxies...
Talk to 3M and their peers.
The way you describe your situation one can imagine it practically squirting water up into the bus.
The more I think upon your situation the more I think that te water is coming from damaged feeder insulation.
Have you Megged it?
Do that first.
Then get back with us...
