Does anyone know of a sefer that lists the Ari Z''L's changes in Tefillah? I do not mean a siddur itself (e.g. Tehillas Hashem), rather, I am referring to a book that outlines the changes preferably with reasons given.
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If you are referring to the changes as featured in the Ba'al HaTanya's siddur, then Sha'ar HaKolel is the sefer you are looking for.
I think you're looking for סידור האר״י : תפילת חיים which takes the original siddur from which the Ari z"l based his changes, and finds the changes he made in the kitvei Ari.