Renault Laguna Automatic Caja

A query, in a Renault Laguna two weeks ago Tube that changed the box that had for another used box, because it was bad as well as the electrovalves, we cause the new electrovalves and the resistance was well, but two days ago I arrived again, but now it does not make any change, and when we place any change in security mode the box, we review again the electrovalvulas and are good, and the discs are good? that it can be, or some suggestion I await your response in advance thank you very much