NEW YORK — A 2017 document detailing a Major League Baseball investigation into allegations of cheating by the New York Yankees will be unsealed, an appeals court ruled Monday. The decision by the 2nd Circuit Court of Appeals represents a legal defeat for the Bronx Bombers, who fought to keep the report under wraps. The document reportedly addresses accusations that the Yankees used YES Network cameras to steal signs. The three-judge panel concluded that MLB’s acknowledgment of the investigation in a 2017 press release undermined the Yankees’ arguments the report should stay secret. “MLB volun…