My year and model has a different arrangement of hoses. But, when the Hoses were removed the Aluminum casting where the hoses seated had deep pits of corrosion on them.
The pits were causing a seeping leak on one of the hoses.

Not an issue with the citric acid flush in of itself; but in the past some have found that the rust or what ever residue was in the cooling system had actually been plugging up some small holes. And as a result of that people have found their Heater Core leaked, a Core/Freeze Plug leaked or the Radiator leaked.

Although this is problem that happened back when people only put Water in their cooling system. Often when people did a coolant flush it loosened the rust in side of the Engine Block and that rust would keep coming off for Months and Months and Months plugging up the Radiator and causing overheating.

I have owned a car since 1968 and the plugged radiator after a flush has happened to me and also to my Father on one of his Cars.

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84 300D, 82 Volvo 244Gl Diesel