I had exact similar issue. I took out carpet - no coolant. Borrowed pressure testing kit from autozone, no pressure drop or leak. Changed the cap to .4 I had .1 . Added Porsche coolant (that's what car had), burped the system and leak is gone for good. Pistonhead has a step by step instruction on how to burp the system.
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2003 Boxster-S.
Black with Tan interior.
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