How can transformer oil leaks be repaired in power transformers?

Transformer oil leaks in power transformers can be repaired by first identifying the source of the leak through visual inspection or pressure testing. Once located, the area can be cleaned and dried, followed by applying a suitable sealant or patching material designed for high-voltage applications. In some cases, replacing damaged gaskets or seals may be necessary. After repairs, the transformer should be refilled with transformer oil and tested for integrity.