Miscellaneous CBP ReleasesAugust 30, 2018 |CustomsCBP issued the following releases on commercial trade and related matters:​Deadline for Filing Generalized System of Preferences (GSP) Retroactive Duty Refund Request -- Sept. 19 (here)ACE CERTIFICATION Scheduled Maintenance Aug. 29 (here)FDA Scheduled Maintenance early morning hours Sept. 1 (here).