3400RL Black Tank Replacement

[bw2]

I am scheduled to have the black tank replaced. I know the vent pipe for the black tank is inside the wall behind the toilet and the entry closet. The wall is available to be opened in the basement area just inside the patio side door. OR did they need to open the wall in the entry closet? Anyone aware how they get into the wall to cut the vent pipe to allow for the tank to be removed and the new tank installed?

Thanks in advance