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Good question. It all depends on the materials used in manufacture. I have found some transformers relatively easy to disassemble, especially the lower power types. The big ones are steeped in tar and are well nigh impossible to take apart. The cost of new laminations is low, so it's really not worth it.
Many open windings are open at the termination and can be repaired without major disassembly. Shorts are another story.
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