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LED DRLs have been in Teslas since 2012 although the design changed over the years. The 2016 headlight module is not repairable (it's exceptionally well-sealed). The entire assembly must be replaced. Not sure I understand your question if this doesn't answer it.
Unfortunately, that is what I believed too, but it transpires that a previous MOT which passed the faulty lamp was wrong!!
The actual title of the failure of the MOT is;
"Position Lamp with a multiple light source more than 1/2 not functioning Nearside Front [4.2.1 (a) (ii)]"
Which means that the DRL is part of the sidelight and as such, the sidelight is not working. So I have to replace the unit at about £650 +VAT