TuSimple co-founder Xiaodi Hou was fired from his CEO, president and CTO posts by the autonomous trucking company’s board, according to a securities filing Monday. Hou, who co-founded TuSimple in 2015 with Mo Chen, was also removed from his position as chairman of the board and member of the board’s government security committee. The firing came a day after The Wall Street Journal published a report citing unnamed sources that TuSimple was facing concurrent probes by the Federal Bureau of Investigation, Securities and Exchange Commission and Committee on Foreign Investment in the U.S. (CFIUS). The investigation is apparently focused on…