OP mentioned dampness under passenger side floor mat, although he's RHD, so that would be our driver's side. I'd bet on a clogged front left drain.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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