I have 7 salty season and 270 000km on mine and no intercooler leak. I find this really strange, but thats not impossible that it failed, like a radiator that could leak too. I dont think anyone ever replace one here. Did they say whats wrong with it? What is the symptoms of the problem you have that made you bring it to the dealer?
Did you have a check engine light? What was the code?
I presume a leaky intercooler would cause a lost of power, probably some kind of compressed air noise when the turbo is spooling and a check engine light.
What fail most often is the wastegate actuator. This cause a very very low power engine, and very high rpm shift point, but no other anormal symptoms (start fine, idle fine etc..). When it start to fail, shutting down and restarting the engine will most of the time magically fix the problem for some time. Check engine should come up after failing a couples of time.