Wild1.8T

My car has been losing boost over last couple of days, I have checked all the piping and there is no leaks. I have KO4 setup (Audi A4 2002 1.8T) and my tuner did do a remap yesterday, as I thought it might be software, the previous map had requested boost of 1950mb but I only get 1800mb (using Vagcom) (only happened over the last 3 days, setup was installed over a month ago) now the new map is a K04 map with requested boost of 2400mb(1.4bar) but the actual boost I am still getting is 1800mb(0.8bar).I now think it might be a fault N75 valve as when you boost you hear the turbo sounding strange like the actuator is open, checked the DV and it is also fine. Will a faulty N249 all cause loss of boost. I am tearing my hair out not knowing what else it could be, pls help

TwentyValveB5+S4

next step is to change out the N75 and see if that helps. did you check the vac lines too?

Wild1.8T

Ok found problem, pipe from N249 came off, was hard to see therefore didnt notice it before thanks