VW Phaeton engine bearing change

Hello dear people, I have a question. I have a Phaeton of an acquaintance who complains about it already a few weeks ago that his car is jerking in the stand so you can even notice it in the seat. Worst of all it should be when it is cold and reduces the ride. For example when driving at a traffic light or something. Unfortunately I have no exact data about the vehicle. I only know that it is a Phaeton with the 3.0 liter diesel engine. He was probably already in a free car Workshop where it was determined that it should be N to the engine bearings. I have read something in this and in other forums and came to the realization that it could actually lie on it and that it was important for many! However, the acquaintance would like me to change the bearings to him. Then I searched everything for a guide for it but unfortunately did not find out on this point. I am indeed a mechanic and my motto also says that the work the But still I wanted to ask if someone can give me a small or even large guide???? Keyword-like would be enough. Only that when the car comes I know about already where I start and what must be dismantled in any case. And what is most important is of course also to know what one might have to pay attention to. About help from you I would be very grateful.