I had both GSA 28 servos fail, one after the other. I was never warned, before installation, that there had already been a "rash of failures" of the servos (that's an actual quote from a Garmin dealer).
After the first one failed, Garmin refused to replace the second one, telling me it wouldn't fail.
But it did. And I was not the only person who had both servos fail. This suggests to me that the failure rate was pretty high, at least for some range of servos.
At least they didn't make me pay for the new servo before sending the second replacement. (With the first one, I had to pay Garmin and then get a credit when I returned the defective one).
To my knowledge, Garmin never recalled the defective servos, so there could still be some defective ones out there, waiting to be installed and then waiting to fail. I could be wrong about that, maybe they did do a recall -- or maybe it was a software problem that they were able to fix without recalling hardware.
Originally Posted by togaflyer
Last year two of mine failed simultaneously while in flight. Garmin replace them. There were great to work with.