Generally it is the same thing. Customers failure to understand what constitutes a failure and what doesn't. If the skid did not allow the tank to move and it still holds fuel, it had done its job regardless of whether or not the welds cracked. Customers were trying to warranty the skids due to cracked welds and no other reason. The skids have never had a single failure. Rather than educate the customer, they succumbed to customer ignorance.