Ventilation crankshaft housings

Hi Leuts

Yesterday I had found some time to change my ventilation hoses and I did not trust my eyes (attachment).I changed the hose from bench to bench and the hose from the right bench,was in an hour. Now my question, how do I get the last tube changed from the left bank.It goes off at the top of the throttle flap, you have to dismantle the whole throttle valve unit (I hope it's true what I say if I'm not eager to learn) to come down to the hose and what do I have to bear in mind?
LG Steven