My leak was the tank mounting screw. One was badly deteriorated and the other one was fine. Since they came in packs of two, I replaced both and problem solved. Since I had the tank off, I replaced to gasket too even though it was OK. Our other toilet was leaking a little around the base occasionally. I called the plumber I had used before and asked him how much to replace the wax ring (at 70, I have pulled my last toilet). He said it couldn't be the wax ring or it would leak every time it was flushed. I told him to replace it anyway. Problem solved. Sometimes you need to know when to argue with the plumber.
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