If you try to access from the bottom, you will have to cut the belly membrane (corrugated abs). On our 06 it is a one piece under belly, with the back tucked up under the rear wall. My dealer had cut mine partially, so I finished the cut, and put a flat aluminum bar across the membrane at the rear. You can see what I'm talking about by looking at the front, as it has aluminum holding it. Perhaps the critter crawled up through where the rear tail light wiring goes into the wall. Seal it up, and see how long you hear it.
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