Okay so long story short, I set my reefer 170 up last night just to find the fitting where my return line connects is leaking..I took it apart and seems that someone put black RTV or silicone on the bottom side of the nut all though I feel as if there’s supposed to be some sort of flat o-ring there. Maybe not, im new to this so I wouldn’t know. I am going to pick up the o-ring replacement kit today and put all new rings on the plumbing however I don’t know that that’s the fix, please help if you’ve ever dealt with this issue…. See pic to see where it’s leaking