Which of the following defects requires repair?

A loose door gasket is crucial for maintaining the integrity and functionality of the container's door system. The primary role of a door gasket is to provide a seal that prevents water ingress and ensures that the contents inside the container remain protected from the environment. If the gasket is loose, it may not form a proper seal when the door is closed, leading to potential leaks or contamination from external elements.

Repairing a loose door gasket is essential not just for the container's structural integrity, but also for the safety and security of its contents. Proper sealing can prevent damage from moisture, pests, and other environmental factors, thus preserving the cargo's condition.

In contrast, while other defects such as a bent J-bar or dents on the surface may be cosmetic or may not severely impact the container's functionality, the loose gasket poses a direct risk to the contents and operations. Therefore, addressing a loose door gasket is a priority to ensure the container remains compliant with safety and operational standards.