Hello, now that I have replaced a torn steering cuff myself, there is something new: the servo pump “sings”, or hums. Only very quietly, now I hear it in the interior. The higher the speed, the higher it hums. Does anyone know that, and how was it repaired? How fast should I act? Still the servo support is normal, but that the part will get stuck, is probably foreseeable or? It could also be the alternator, but the sound seems to come rather from the servo pump.