Fair enough, sounds a lot like a collapsed pulley from the description. This is the problem with remote diagnosis, your whir is my whistle, if you know what I mean. Giggidy. 
The only boost hose that you can pop is accessible from the drivers wheel-arch, have a look in there with the engine running and spray some watered down washing-up liquid all over it, should be easy enough to tell if its leaking.
Not off the actuator, goes from the turbo outlet to the plastic boost pipe. There's only the one silicone pipe down there, nothing to get confused over.
The only boost hose that you can pop is accessible from the drivers wheel-arch, have a look in there with the engine running and spray some watered down washing-up liquid all over it, should be easy enough to tell if its leaking.
Not off the actuator, goes from the turbo outlet to the plastic boost pipe. There's only the one silicone pipe down there, nothing to get confused over.