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The engine oil cooler runs coolant/oil through a heat exchanger that has been known to leak once in awhile. But if they did compression and leak down tests and said #6 leaked, I would tend to rely on that.
The radiators have a plastic tank that frequently cracks and leaks coolant and can result in overheating. It seems entirely possible to me that overheated aluminum engine/heads could warp.
Preventing Cylinder Head Gasket and Cooling System Failures
The radiators have a plastic tank that frequently cracks and leaks coolant and can result in overheating. It seems entirely possible to me that overheated aluminum engine/heads could warp.
Preventing Cylinder Head Gasket and Cooling System Failures