Las Vegas (AP) - It garners a mere one-paragraph mention in the quarterly earnings report, but the private equity buyers of Harrah's Entertainment Inc. could have a colossal USD 2.8 billion problem on their hands. The world's largest casino company by revenue inherited a legal quagmire that dates back to 2000. That's when Arthur Goldberg, then chief executive of Park Place Entertainment Corp., signed a deal with the St. Regis Mohawk Tribe to acquire the exclusive rights to jointly develop a casino in the Catskills in upstate New York, just a 90-minute drive from Manhattan.