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Are they bulbs or LED units?
First thing I'd do is pop them out & look at the connectors to make sure there's no corrosion / water ingress.
If they're LEDs I believe it's a whole unit, normal bulbs are just a bulb replacement.
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Current: 2009 E90 325i M Sport Auto
Previous: 2017 435d xDrive Gran Coupe, 2010 E90 318d SE, 2009 E90 318i SE.
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