An investor in CBS Corp. has sued the New York-based media giant for a copy of an internal report that led to the ouster of former CEO Les Moonves, as well as other corporate records, to determine whether the board mishandled its investigation or should have sought to reclaim $1 billion in salary the company paid to the disgraced executive.

The lawsuit, filed Wednesday in Delaware Chancery Court, alleged it was “common knowledge” among board members that Moonves had committed repeated acts of sexual misconduct “before and throughout” his tenure as chief executive, and that some directors had even warned Moonves about the probe, which ultimately prompted his resignation in September.