Inspection After Removal
WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Oil Cooler
Check oil cooler for cracks. Check oil cooler for clogging by blowing compressed air through engine coolant inlet. If necessary, replace oil cooler assembly.
Relief Valve
Check relief valve for movement, cracks and breaks by pushing the ball. If necessary, replace relief valve.