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Thanks for the ideas. The flush valve sounds like the best bet for the next thing to try changing. Given that the problem is intermittent, it seems like it's got to be something that's perturbed on each flush, and the flush valve seems like the most likely thing after the flapper that fits...

Replacing the flapper was my first thought, too, and I've tried that - more than once. Here's the bizarre thing: I actually have 3 other of basically the same Toto toilet that all work fine. I've swapped flappers between them, and the others keep working and this one keeps leaking. So I'm...

Yes, the hose is properly clipped to the tube. I'm pretty sure it's not a siphoning issue, if that's what you're getting at. The toilet fills after each flush exactly to the fill line marked on the overflow tube (about half an inch below the top of the tube) - there's no water running over...

I have a 2-year old Toto Drake (C744S) that's had a persistent problem with leaking into the bowl. I've noticed there are several threads here on similar problems, but after reading all of them I'm still at a loss on how to fix it. The problem is a very slow leak, I *think* through the...