Former Enron CEO Jeff Skilling, right, arrives at the federal courthouse with his attorney, Daniel Petrocelli, left, for his sentencing hearing in October 2006. ((David J. Phillip/Associated Press))

Lawyers for Jeffrey Skilling are appealing a decision to uphold the former Enron Corp. CEO's conviction for his role in the once-mighty energy company's collapse.

Skilling's attorneys on Tuesday filed a motion to have a three-judge panel of the 5th U.S. Circuit Court of Appeals in New Orleans rehear his case.

Earlier this month, the panel disagreed with Skilling's claims that his conviction was invalid because of incorrect legal theory, faulty jury instructions, a biased jury and prosecutorial misconduct.

Skilling's attorneys also filed a motion for a hearing before the entire 5th Circuit.

The appellate panel has ordered that Skilling be resentenced, saying a guideline was improperly applied, resulting in a longer prison term. Skilling was originally given a 24-year sentence.