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I am working on my Cavalier AC now. It has a leak somewhere where refrigerant leaks out. I evacuated it for a long time. Then put it on just gauges. The high side held vacuum. The low side did not.  There was circulation so I know the compressor is working. I put in some new orings but not the flat type orings. Didn't have it at the time. Found the flat washer seal oring and will replace them in the compressor this weekend. I have a new accumulator for it but do not want to put it in until I find the leak. From the oil stains , it looks like its the compressor inlet and outlet. Where is another very common place to leak? I have a leak sensor and will use it this weekend. Just some general guidance of typical leak points would be appreciated. Thanks