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Well, this toilet is still causing problems, and finally got around to have some time to play with it today. Ended up having a plumber friend come over as well. Still seems the problem is from either...

Thanks for the info. Rather than take any chances, I replaced the fill valve and the flapper with Korky products mentioned in this thread. Seems to be working - will monitor for a day or so, but...

Finally got around to addressing this problem. The tank was definitely leaking - the water was way down today inside the tank. I took out the screen - it looks pretty clean to me. I also don't see...

Will check all these methods as soon as I can. Perhaps their phones were down for a while - I dialed both their regular and 888 number correctly several times with not in service message - ended up...

Thanks - will give this a try later tonight.

Any idea how to contact Toto? The numbers listed on their website are not in service - never a good sign. Also, how do I check the incoming water pressure?

The valve is fully open. It makes this noise when the toilet has been sitting - did it all night last night - at some points it was about every 1/2 hour, then it slowed down and was less frequent,...

I have a Toto Supreme E Max that was installed about 8 months ago. It is just starting to make loud whining noise intermittently, and when I take the top off the tank there appears to be a slow drip...