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Old 05-29-2019, 04:01 PM   #2
MSUDave
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Join Date: Jan 2017
Posts: 4
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I received some additional information:

The ‘bubble’ is close to a seam that runs down the middle of the rear half section (lengthwise). When visible it is appropriately 3 inches square. It was not visible today - but has been in the past.
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