Yeah, they leak. Just accept it. Do you have to fix them right now? No. Do you have to fix them all at once? No. Do soft cores mean you have leaks below? Not necessarily. Look carefully at the fuel tank tops, especially around the fuel fill deck connections. If there is any rust at all, be careful. It might have rusted through, or be about to, and it's difficult to see with only 3 or 4 inches clearance from the deck above.