V70I: electric window lifter defective on driver’s side

Hello guys. I bought “new” n V70 2.5-litre gasoline. Super Ding. The only thing, the electric window lifters on the left (driver) side do not work (I bought so, I dip ). Both. Front and rear. On the right side they do quite normal; the window lifter switch in the driver’s door has already been changed for a new one; this unfortunately did not bring any improvement (the old one was also right). Recently I had him because of another thing in the workshop, the guy meant to pick up (my wife ), that it might be due to the “platine”. Question now: What a “platine” could he mean, where is this, where could I get a “new” from. Or does someone know the part number, also have contact to a Volvo and part dealer. Sorry, I am a bit unnecessary in terms of screwing, so the questioning hopefully you know what, so I don’t want to drive through the summer, if you understand many thanks already…