2010 Mazda CX-9 pics and problems…Help

Hello everyone. I currently own a 2010 Mazda cx-9 AWD and I took it to the shop a couple of days ago for a leak it had developed and also a noise underneath. I received these pictures from the mechanic, can anyone help me by telling me what this part is and where I could find a replacement? Any help would be greatly appreciated.
 

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Your mechanic didn,t tell you what it is? It is the rear diff, if it still works you need to get it sealed again, not change it...
 
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