This means that a Non Intrusive Inspection (x-ray) has been ordered and the cargo has been held. A NII completed message, (7I) may follow indicating that the inspection is completed.

or

Disposition code 7H means Non Intrusive Inspection – Generated to an AMS carrier when a new bill of lading has been selected for a NII exam.

NII Exam- This exam is also known as a Non-Intrusive Inspection (NII) or a VACIS exam. CBP simply orders the container to be driven through the X-ray machine at the ocean terminal and reviews the pictures.

Response will change once they are done.