[Chuzz]

I would suspect that the seal around the rear windshield is leaking. Either that or what ForteGT2 said. Does it smell like urine?

 

[Chuzz]

This is a old Known issue. Search forums / google etc for any tsb about the issue

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You say it's an old, known issue, but you don't say what the issue is. Do you not recall? That would have been easier for all of us.

 

[Chuzz]

So, I'm guessing that Veronica isn't coming back to find a solution.