I just took ours apart for the same reason. In our case, it turns out that one of the two water indicators was cracked (at the top), causing the leak. The cracks were invisible without taking it apart.
There's a bigger leak near the bottom of the same piece, where a piece of the plastic is missing:
On the upside, the wk600 is really well designed - easy to take apart for repair. But I can't find replacement parts anywhere...
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