V60 Exchange brake discs and rear pads for electric parkpremse – Problems

Hello dear community! I would have liked to have heard your opinion on the above mentioned topic. I was in a free workshop today and wanted to have the rear brake discs and pads changed at my V60. After half an hour a call came from the workshop that the repair can not be carried out, because a parking brake actuator cannot be brought into the service position. I have to say that both the service brake and the parking brake perfectly without unusual They wanted to explain to me that I need a new brake caliper with actuator motor for just under 500 euros. That can’t be possible, can it? I told them now to reassemble tyres and do nothing.. Does anyone know about it? Can a change of the brake caliper really be necessary if everything else is to be funktoniert? Ask for your opinion.. Thank you!!