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We have a 2015 3910 with the same setup. Have not had a problem with the half bath. Agree with the recommendations above, if you have flushed the tank well, I would look at the vent.
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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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