Lots of people. Could be a lot of things like people have said. Either the heater hose/pipe, the turbo coolant return that wraps around the back of the engine, or a core plug. I have seen all three. If you want me to guess wildly though I would bet it's one of those hoses for the turbo coolant return. Or the brazing/welding for the Y- section has failed. Get a borescope down there to be 100% sure.
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