993s Oil cooler / radiator leaks

[911cedric]

Hi All,

i've noticed tonight while i was noticing some damages under the front bumper
that i have oil dripping from the oil cooler at the front of the car passenger side.
I can see through the bumper grill a nasty splash of oil and gunk on the lower part of the radiator.

I'm watching the PET, and i see the feeders connecting the upper part of the radiator.
What is it the most common failure?, the hoses, unions, rings, or the radiator itself?