2017 Mercedes Benz GLC led running lights/indicators changing colours

There was a recall in the States with this problem , you could try contacting the dealership if they can help towards fixing / costs .

https://www.motorsafety.org/mercedes-benz-recalls-more-than-4700-vehicles-for-incorrect-turn-signal-light-color/

But maybe unlikely going by this Merc owners experience with similar fault

" I have a 2017 GLC 43 and the front orange turn indicators have changed colour to a very bright pink! Has anyone else had this issue. The dealer says he has seen it before and I need two new headlight units to cure at a cost of £1500 per unit!!!!!"