Scholars from the Academy of the Hebrew Language who have been analyzing the codex discovered that it contains hundreds of corrections meant to bring it into line with the familiar biblical text we know today. The changes were made by erasing, altering or adding letters and vocalization marks.Or at least a long tradition of variant readings.
These changes show that back when the Leningrad Codex was written, roughly a millennium ago, the Jewish bookshelf contained several different versions of the biblical text.
Other PaleoJudaica posts on the Leningrad Codex of the Hebrew Bible are here, here, here, here, and links.
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