MADISON, Wis. — In attempting to explain her two-year work hiatus in the early to mid-1990s, Democratic gubernatorial candidate Mary Burke has said she was just burned out after an intense period of leading European operations for Trek Bicycle Corp., her family’s Waterloo-based global manufacturer. In fact, Burke apparently was fired by her own family following steep overseas financial losses and plummeting morale among Burke’s European sales staff, multiple former Trek executives and employees told Wisconsin Reporter.