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That is the PCV, It opens to vent vapor pressure from the crankcase when engine is shut down . The corrugated hose that the PCV is attached to vents vapors from bank 2 to the AOS. The hose is very brittle and will most likely break when you attempt to replace the PCV if not extremely careful. The hose is a POS to change. Good Luck
PS the leak is actually the round opening above your arrow.
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