The toilet ran because the drain valve would not close. The old gasket didn't look too bad to cause a problem. But I replaced the gasket and cheers! Problem solved, the seal is very easy to replace. It only took about 5 minutes. Anyone could do it. But how to do this is not necessarily obvious. It has a few YouTube videos in it, so search "replace the Kohler canister purge valve gasket" or something. $7.80 seems a bit expensive for 3 rubber pads, but considering the shipping it's not bad.
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