What you are describing sounds more like one of the conductors is broken, or one of the connectors is failing.
With electrical power cords going underwater . . . it's more likely to be a replacement than a 'repair'. I'd recommend calling Aquabot. See if they can sell you a replacement cord. If they can, than you'll also need to determine whether this is a repair you can tackle, or one that will require a factory authorized agent.
Ben
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