The Chapter 7 trustee for an ex-client of O’Melveny & Myers is turning to the U.S. Court of Appeals for the Ninth Circuit in hopes of resuscitating a $54 million legal malpractice lawsuit against the law firm.

Jeffrey Golden, a partner at Weiland Golden Goodrich who is serving as the Chapter 7 trustee of Aletheia Research and Management, filed a notice of appeal in Los Angeles federal court Thursday, 20 days after U.S. District Judge Christina Snyder of the Central District of California approved an arbitration award that absolved O’Melveny of claims that it bungled its representation of its bankrupt client.