By Dan Levine SAN FRANCISCO - Several U.S. appeals court judges appeared skeptical on Thursday about the Department of Justice's attempt to preserve a criminal conviction against baseball home run king Barry Bonds that resulted from a steroids probe. The case involves testimony Bonds gave to a grand jury in 2003 about whether he used steroids to help him bash more long balls. Last year, a three-judge panel of the 9th U.S. Circuit Court of Appeals in San Francisco affirmed a conviction against him for obstruction of justice. However, the full 9th Circuit voted to rehear the case. ...