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If they are pulling the engine for a fix, then I would assume it would be the mechatronics sleeve or harness o-ring. I had mine replaced under CPO with about 30k miles on the car, now at 100K miles and hasn't leaked from there again.
I've also not seen posts at least here about recurrence, may be a good idea to look around the other forums to see if people report it becoming an issue again.
I thought I read somewhere that the newer part is a bit larger or more robust or something than when the cars were originally built.
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