I have a leaking A/C compressor, verified with UV Dye added to the refrigerant system. It is not leaking from either the high or low side refrigerant ports, but rather what looks to be a sight glass or similar on the very bottom of the compressor. I didn't have a camera with me when I was out there but looking at the compressor online, It is leaking from the area indicated in the below photo (red arrow pointing to the leak). If I had to guess, I would think this is the oil drain port on the compressor as it is basically the lowest point. My question is, is there anything I can tighten here to stop the leak? There is a snap ring there, but I'm not sure what it's holding in and I'd like to know a bit more before pulling the compressor and playing with it.