Mr Cook's alleged fraud was raised by another staff member at Mitsubishi and a staff member at car dealership owner AHG, sources said. Investigations by Mitsubishi and Automotive Holdings Group found no wrongdoing by either the "whistleblower" or the AHG staffer. AHG rival AP Eagers, which also has a partnership with Mitsubishi, declined to answer questions about whether it was investigating any dealings with Mr Cook. "We know no facts and we're simply not prepared to make any comment about this.