Have seen a couple of times. Air getting under the roof membrane, front cap loose, bad cap caulk, or a front tear can cause. If not fixed, more and more of the rubber membrane will separate from the roof.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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