What is the remedy for a federal judge's error in failing to review and excise irrelevant material from a witness diary?

In a forthright concession, the government admits that the district judge erred in failing to review the diary in camera and to excise irrelevant material himself. Brief of Appellee at 43. The remedy for this error is to vacate the judgment and remand for an in camera hearing. Ogden v. United States, 303 F.2d 724, 737-38 (9th Cir.1962). If the district court finds the expurgated material not relevant to the subject matter of the witness's testimony, it may enter a new final judgment. If, on the other hand, it finds that relevant material was excised, it must order a new trial unless it determines that substantial rights of the defendant were not affected by the omission. Id. at 737-38.