I'm surprised that no one has replied to this. Maybe a post on the 240 section might do the trick.
Idea for testing. Cover the whole of the trunk area with newspaper. Cover that with plastic. In one piece if possible or seal the sections with duct tape. Cover that with newspaper and wait for the next rain or use your hose as a sprinkler, Don't jet the water. Check to see where the water has dripped in. The plastic is to stop the top paper being made wet from underneath. If you get no sign of leakage on the top paper, careful remove the top paper and plastic and see if there are any wet patches on the lower papers.
Sprinkling talcum powder in suspect areas will often show up water trails. You might want to make a ring of talc around the spare wheel wells to see where the entry point for water is.
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