Yeah, i have an RS so it's the Xenon unit. Essentially water ingress causing the DRL to die, other lights still works fine. I discovered one of the cap is loose which allow water to collect and condensing inside the unit, it took a bit of a force to snap it back in place.
Good thing that you ask, upon delivery of your new car, pop up the bonnet and check that all the headlight's black sealing caps is close tightly.
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