I had similar issues with one of my Aethers. I ordered 6 kits, with the intention of using 5 this year and having one as a spare. Well... it's good I ordered the spare.
I assembled all the boards and once I got them all to work perfectly outside the cases, I started installing them into the cases. The fifth one I put in the case had this issue where the LED in the upper left corner was glowing red. I checked for a short between the rectangular pad on the top of the LED and the board, and there was a short. Dang! Thinking that is must have been a stray piece of aluminum somehow got stuck between the LED and board (which is possible because I didn't put so much adhesive on that it was oozing out... I did just enough to coat it nicely with no obviously exposed metal still visible), I tried compressed air, shaking the thing hoping that a tiny piece of aluminum falls out of some crevice somewhere, poking around, looking closely around the LED legs, but nothing worked to resolve the issue.
I thought it was maybe something on the other side of the board, so I unscrewed the screws holding the board in the case, and the LED didn't glow any more. After taking it in and out a few times, it's working fine again with the board screwed into the case. But there is a still short between the LED and board. I'm not at the light right now, but at the top of my head, I think the one to the left of it has the same short as well, but it doesn't (and never did) glow. Come to think of it, the same adjacent LED light sometimes had the short issue, and sometimes it didn't. The last time I checked it, there was a short.
Is the glowing red LED (or "short" problem I have now) problem likely due to a bit of Aluminum somewhere?
Perhaps the assembly instructions should be changed to have us place the board into the case, mark the aluminum bracket with a pencil to get the alignment, remove the board, and then do the drilling--thus avoiding all these little pieces of aluminum flying all over the place. I find it odd drilling with such valuable circuit board right in the case, but thought I should follow the instructions in case it made alignment of the drilled holes better. I did the best job I could to remove all specks of aluminum from inside the case, both sides of the board, and I even loosened the screws holding the brackets to the case because of small bits being wedged in between there, so I could clean that out too.
If this light becomes problematic, for future reference, what is the best way to pop off the LED? Do you think I can pop it off while still soldered in, stick more thermal adhesive underneath, or would the LED have to be desoldered and removed altogether first before regluing... that wouldn't be a pretty task.