Checking every inch (and especially all of the connections) in an A/C system is the only way to find a slow leak. Its almost as painful as trying to find a short in a wire harness. You're on the right path, just be persistent.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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