Range Rover Sport TDV6 2007 problems

Hi all i have some problems lately with my RRS. I have it for 5 years now and no problems at all with it.

But i found some problems lately:

- if i drive to steep hill with high speed i get Engine system fault: code reads as P132B (Turbocharger boost control A performance)
and P023D (Manifold absolute pressure - Turbocharger boost sensor A correlation)

- and i notice that i hear a small weird sound, like someone would exhale when i drive in low gear and release gas pedal. It is like hhhhhhh,
i am not an expert but would say like there is a leak somewhere, but this only happens at small speed, low gear (1-4).

So if anyone has some idea that would be fantastic. I really appreciate all help.

Hope nothing really serious with the car, because on normal highway and city roads it runs perfect like it did before.

Thanks, Matjaz

The first thing I would be checking is all the turbo /intercooler rubber hoses to check for splits/holes in of if they are perished.
I'm not sure how accessible they are on the tdv6 though...