Three executives from troubled imaging giant Olympus have pleaded guilty to artificially boosting the company's true value in 2007 and 2008 by concealing losses in financial statements. Former chairman Tsuyoshi Kikukawa, ex-auditor Hideo Yamada and former VP Hisashi Mori were charged with fraud in the scandal, which was brought to light last year by ex-CEO Michael Woodford. He was fired by the Olympus board for blowing the whistle, but reportedly received a large settlement for his troubles. The company has since confessed to cooking the books as far back as the '90s to hide investment losses, and revealed in 2011 that it had a billion dollars less in value than previously stated. That, along with the poor performance of its camera division, has forced Olympus to seek a partner or raise capital to survive.