Hi Mark, I've got the same problem, driver's side (front only) wet but without the oily substance/vinegar smell. Just soaking wet. The dealer says they cleaned out the drains, kept my car for 4 days and "ran a hose on it" over the weekend. Couldn't identify the source. Still leaks. They told me upfront that leaks are hard to diagnose so I guess I'm just supposed to live with it? Now I've got a moldy smell. I've been really unimpressed with the Portland dealer in general so I'm hoping you might have better luck finding an answer. If you do find a solution, please post. I've read the other wet carpet posts and it would appear that the dealer has tried everything they've suggested. Good luck!
As soon as I find out what the problem is, I will post it.