I am very surprised that Mercedes says it's a Winnebago issue. I have the Via which is almost identical to the Reyo and it has Mercedes Sprinter headlights, the Mercedes Sprinter headlight switch and the circuit and fuse is the same as Sprinter, I can't imagine Winnebago would have changed anything. They received the Sprinter chassis with the Sprinter dash and all wiring intact. Mine has the same headlights and lamp sockets and bucket covers as a Sprinter. Here is how they received the chassis. What do you mean by SAM?
I'm assuming you tried new lamps already, they don't last long with the DRLs although both hi and lo would be strange.
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Brian
2011 Winnebago Via 25Q on 2010 Sprinter Chassis
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