Yes. Sloppy sealing. Replaced with better quality rubber seals, and problem gone. Did it within the first 30 days of ownership. Like you, it was just one door. Seals looked OK, until the hose test.
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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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