In relation to the increase in related complaints about noise pollution, the company is unable to carry out a truthful, accurate and definitive diagnosis of dry-type transformers, by which it is possible to identify whether or not they actually comply with the permitted levels established by the applicable standard (NTC 5978); causing in the first measure: that the transformer is defective, in the second: if this happens, it cannot be followed up properly when a claim is filed by the customers and finally: the impact on the company's image due to the loss gradual credibility.