Gil's suggestion is a good one. I had a 6 year battle with ours, and that strategy helped me find the problem, eventually. Solving the problem was a different saga.
I'd look closely at the float assembly for the leak (though it may not be the actual problem). Mine was leaking, not because it was faulty but because the drain chopper was broken and main circulation pump was failing. This left too much debris and suds in the cabinet, which overflowed the float tube.
Once I replaced the chopper blade (which is absurdly built with a rust-prone plain steel spring) and then the entire bottom plate assembly (which supports the circulation pump), my float stopped leaking.