Do you have any aftermarket parts? Wires running into the cabin through the firewall? Most common cause of this is the firewall rubber bushing on the firewall down and behind your break fluid reservoir. Start there. water drains down that spot and will follow wires in if not run properly. I had that problem till I made a slit in the grommet and made it fit back into position.
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40th-40th edition. HFC, Nismo exhaust, Stillen intakes, GTR start, UpRev
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