 Shortly after the deal was finalised, Mitsubishi became embroiled in accusations that it had covered up complaints from customers about defects in their vehicles.A police raid on its headquarters in July 2000 uncovered hidden documents stashed in a locker, and soon after over 500,000 vehicles were recalled for repairs.Mitsubishi's shares fell by 13 percent as these revelations became public, and over the summer, further investigations took a similar toll on the company's stock.