Following a straightening procedure, a technician discovers tiny cracks in a fender apron. Technician A says the entire panel needs replaced. Technician B says the cracks can be repaired using a patch plate. Who is right?

In this situation, Technician A's assertion that the entire panel needs to be replaced is correct. When dealing with structural components, such as a fender apron, the integrity of the metal is crucial for the safety and performance of the vehicle. Tiny cracks can compromise the strength of the panel and may lead to further issues if not addressed properly. Replacement ensures that the structural integrity is restored, as welding or patching cracks can sometimes lead to additional weaknesses or failures over time, especially in areas that experience stress.

On the other hand, Technician B’s suggestion of repairing cracks with a patch plate might seem viable in less critical applications or cosmetic damages. However, in the case of a fender apron—being a structural component—it is generally advisable to replace any panel with structural compromise rather than attempting a repair. This is due to safety considerations and the importance of maintaining the original design specifications for the vehicle.

Overall, the decision to replace rather than repair when tiny cracks are present in critical structural members aligns with best practices in auto repair, ensuring the longevity and safety of the vehicle.