Since the depression is on the outside of the rear shell, that means something on the inside of the front shell pressed or slid on it. I would first close and latch the rear shell, then grab a 2-foot piece of masking tape and stick it vertically on the depressed area, so the bottom end hangs down. Then close the front shell slowly and carefully, gradually covering the tape until the wall is a foot or so short of closing. Now put another piece of marker tape on the wall of the front shell, at the same location as the tape on the inner shell, and open it back up again. Now check the inside of the front shell wall at the place indicated by the second tape. Is there anything protruding from the inside of the wall at that point? Or is the inside of the wall scratched at all?
Assuming you have a 2720, it appears to be right in the area of the rear edge of the upper half of the Dutch door frame. There must be something fairly rigid at that point, and even if it wouldn't normally contact the rear shell, an overzealous slam down of the front shell caused it to push inward.
Bill
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