Repair is needed when inspections reveal issues like insulation degradation, oil contamination, overheating, or mechanical damage. Repairs involve diagnosing the problem, removing the transformer from service, and conducting necessary repairs such as rewinding coils, replacing insulation, or refurbishing cooling systems. Oil may be purified or replaced. After repairs, the transformer undergoes rigorous testing before reinstallation. Timely repairs prevent failures, extend the transformer’s lifespan, and maintain operational reliability.