[Humpda]

Hi
Purchased a 2007 Swift recently for a family member. Low KM with regular service history. Doing a detail and realised that there was water damage in carpet lining in rear passenger footwell, looked like dirt as it was under the seat. On the reverse of the car matt was what looked like a little bit of mould. Had a look under the car and there are no obvious culprits that i can see .. no larger cracks or openings that scream out. No water in the spare wheel well either or in boot. Nothing on the other side of the rear seats either or in the front driver or passenger seats. Any ideas of where i can start looking? Thanks heaps