I have that exact same problem on my 3950, the shower mix box is leaking from behind the cover. When it was at the stealership last week I was going to have them replace it under warranty, however they didn't have the right color to match. They have it on order and should be shipping it to my house along with a few other PDI parts Dutchmen messed up on when they were shipped to the dealer.
Edit: First question from the service manager, when I advised of this new issue post PDI was (Did we winterize the unit?) Of course my answer was yes, as I knew for a fact there was antifreeze in the shower controls.
As for replacing it, you should have an access cover (Screw type, big circle) just above the shower controls, this is the access panel to get to all the plumbing for the shower controls from behind.
Search these forums about replacing the screws in the shower to stainless, for a picture of the access panel.
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2015 GMC Denali 3500 DRW
2014 Dutchmen Voltage 3950
Toys: 2010 ArcticCat ThunderCat 1000, 2012 Yahama Raptor 250, 2012 Yahama Grizzly 550 EPS, Canoe, Kayak
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