Customer returns for the same issue: how to check warranty

I learned this from a case that seemed small in a workshop with a comeback after a repair. The problem was that the customer said it was the same fault, but the symptom had changed. At first, it didn't seem serious, but in a real work environment, that type of detail can affect times, costs, or customer trust. Avoid changing several things at the same time. Compare the previous RO, codes, parts…