I'm looking for pointers on which readings (on/kun) were changed in the 2010 reform. By that I mean which kanji has additional readings and which kanji has had one or more readings removed? Is there a document that summarizes these changes?
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The official 改定常用漢字表 ("Revised Jōyō Kanji Chart") itself contains this information. It starts on page 169 of the document, which is page 203 of the PDF, under the heading 「現行「常用漢字表」からの変更点一覧」.