Does the charging warranty apply to MacBooks?

Familiar problem, isn't it? Some kind of damage has occurred in the wire or in the connector with pins. It would seem - what is easier to change under warranty?

However, many buyers are faced with the fact that the service centers refuse to change the charge, arguing that Apple considers them expendable material and does not give a guarantee. All anything, but the price of a plastic box with the wiring is $ 80-100.

But there is another opinion. Such statements - a personal initiative of service centers, and in fact a friendly Apple changes its charge - just call the coveted magic number in the European branch - and immediately change it.
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I would like to know - have you encountered such a problem? How did you respond to it in the service center? Or maybe you yourself successfully repaired such a polmku and tell me how to do it yourself?