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Thank you. You certainly appear to have in-depth knowledge of these toilets, and I suspect that the fill valve seal may be to blame. That's the sort of thing a novice like me is unlikely to think of. I will order a replacement seal. Thanks again!

Thank you so much. Your ideas and investigative procedures are quite interesting, and I will definitely use your advice!

Thank you very much for taking the time to reply. Your diagnosis seems correct, though I don't understand why the toilet would make this sound repeatedly (approx. 5-6 times/second), as if the fill were starting, then stopping multiple times in rapid succession. (Perhaps I should attempt to...

I have a Toto Soiree toilet (CST 964 CF). Some minutes after flushing it, and after the toilet has filled, it will make a sound like "goosh, goosh, goosh, goosh". This sound continues for 4 - 5 seconds before stopping. A few minutes later this sound will repeat, until I flush the same toilet...