Sen. Elizabeth Warren (D-Mass.) has reportedly urged the Securities and Exchange Commission to investigate Tesla Inc.‘s (NASDAQ:TSLA) board independence. What Happened: Warren wrote to the SEC, expressing her concerns about the board’s independence from CEO Elon Musk, who she believes may be using his control for personal gain rather than the benefit of Tesla’s shareholders, The Wall Street Journal reported. This is not the first time Warren has raised these concerns, as she previously wrote to the SEC last summer. In the letter sent this week, Warren expressed concerns about potential conflic…