Perished hose on intake manifold / boost leak
I'm 99% I've got a boost leak - I can hear the turbo spinning quite loudly but it's not translating into much extra power!
I've rummaged around and the only perished hose I can find is the one on the top right of the intake manifold which I can't really figure out what it's doing - it runs off a few places out of sight! Any ideas what it does and if it would be having an impact?
I've scanned for faults and the only one that comes up is:
16795 - Secondary Air Injection System: Incorrect Flow Detected
P0411 - 35-10 - - - Intermittent
I've seen another thread (which I now can't find) which suggested this could be due to the N112, however I've not been able to check that yet - helpfully the screws holding the plastic trim onto the plate it's mounted under have been rounded off so I'll be drilling them out at the weekend!
Any other suggestions?