Faulty parts are often sold. You will bring such a detail to the service station, and there it will be deployed in the direction of further search))) Of course, the item can be returned, and no one forbids to inspect it when buying, but without being an expert, it is difficult to understand whether it is working properly or not, and they (employees) seem to be specialists.
For spare parts, everything seems to be quite clear, here is some kind of house from a hundred, there is no call on the phone, and so to speak, the service for the initial appeal took a day to return to them again, for elimination.
They are trying / but there is a gap.