My cobra explorer started taking on water. What I did was close all my hatches and opened the drain plug, I then rigged a hand air pump to the drain plug hole and made it as air tight as I could , douse the outside of the yak with car wash soap and pumped away. Bubbles will form wherever air escapes.
I would try this before filling your yak up w/water, oh and also check to make sure your drain plug is water tight too.
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