A federal judge in Los Angeles on Monday confirmed an arbitration award absolving O’Melveny & Myers of claims that it bungled a nearly decade-old representation, defeating a $54 million lawsuit filed by its ex-client’s Chapter 7 trustee.

In her 34-page ruling dated Friday, District Judge Christina Snyder rejected the contention by the Chapter 7 trustee of Aletheia Research and Management that the arbitrator was biased because he blamed the trustee for his son’s failure to secure summer associate positions at both O’Melveny and Gibson, Dunn & Crutcher, the firm representing O’Melveny and its lawyers in the malpractice dispute.