Which of the following denoted the need for repair in corner protection plates?

The need for repair in corner protection plates is best indicated by any related deformation. Corner protection plates are designed to absorb impact and protect the structure of the container. When deformation occurs, it signifies that the integrity of the corner protection has been compromised, which can affect the overall strength and functionality of the container. Even minor distortions can lead to further damage if not addressed, making deformation a critical factor to assess during inspections.

While surface debris accumulation, change in color, and presence of rust marks may indicate various forms of wear or deterioration, they do not necessarily pinpoint structural integrity issues as directly as deformation does. Debris can often be cleaned or removed without repair being necessary. A change in color might indicate surface treatments or aging rather than actual damage. Rust marks could suggest corrosion problems, but unless they lead to deformation, they do not indicate an immediate need for repair in the way that physical deformation does. This is why deformation is the most significant indicator necessitating repairs in corner protection plates.