Garmin does not allow field repairs, or provide parts for their units. Those are complex knobs and are probably not easily replaceable.
In October of 2021 I discussed with Garmin an issue I've had with the rear mounting points cracking out on my GDU 370 and 375. I asked if they could allow me to purchase the rear unit covers. They responded;
"The best we can do is exchange your displays at half price. We can't repair them because we don't have parts available anymore, but we do have some units in stock."
The exchange cost was $620 each with limited warranty.
While it is true that we cannot send out housings for the units, we are able to get a replacement knob sent out for you, please send us an email at [email protected], and we can get you set up.
While it is true that we cannot send out housings for the units, we are able to get a replacement knob sent out for you, please send us an email at [email protected], and we can get you set up.