You need to find someone to charge it up with freon and some fluorescent dye and run it till it quits again. Look all around the innards of your unit with a blacklight and you will surely find the leak. I never had much luck with electronic leak detectors unless I was lucky enough to have the probe right on top of a gross leak.
A lot of decent A/C shops pressurize a suspected leaky system up with about 100 lbs of nitrogen or argon. Then they spray soapy solution on everything and look for bubbles. Sometimes there are still some places that you can't get soapy solution to. That is why I like the dye.
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