A/C problems are tough to evaluate. If you can bring it to an a/c shop, they may be able to pressurize it with inert gas and locate the leak. But it's not just that the compressor and plumbing may be compromised. If it doesn't hold a charge, you can't evaluate the CC head unit, sensors and the vacuum system. $3000 is probably far too much, but it can certainly end up being a three figure repair.
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