You've got a leak no matter what you've been told. It could be anywhere, but the needle valves on the service ports can fool some mechanics. Sometimes, they'll hook ou their guages and look for a leak-down, but forget that the valves are not being tested in this scenario.
You should be able to locate any leak as bad as you describe using soapy water. This is the best way to test the valves in the service ports and it works for any part of the system.
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