• Here are a few options
• keeping in mind common usage in South American Spanish for defect descriptions: 1. **Se ha reemplazado la franja superior de la espalda.** * (This is probably the most natural and common way to say it. "Franja" is often used for stripes on clothing/flags
• "espalda" for the back of a shirt
• and "se ha reemplazado" is a common impersonal passive construction.) 2. **La franja superior de la parte trasera ha sido reemplazada.** * ("Parte trasera" is also very clear for "reverse/back part.") 3. **Se cambió la franja superior de la espalda.** * ("Se cambió" is a slightly more colloquial but perfectly understandable way to say "it was changed/replaced.") 4. **La raya superior del reverso ha sido reemplazada.** * ("Raya" is also a valid word for stripe
• and "reverso" is a direct translation of reverse
• though "espalda" or "parte trasera" are more common for garments.) I'd recommend **Option 1** or **Option 2** for a formal defect report. **Option 3** is also excellent and very common.

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