Whether a federal prisoner's direct appeal for sentencing issues must be remanded to the district court for resentencing when a retroactive amendment to the Sentencing Guidelines lowers the appellant's guidelines range

QUESTION(S) PRESENTED ; While a federal prisoner's direct appeal is pending for sentencing issues, and retroactive Amendment 821 is enacted which now lowers the appellant's guidelines range, is the appellate court required to remand to the district court for resentencing? 2