Thanks to this thread, I was able to diagnose and repair my LHS Rear blinker not working issue.FIXED!!! Thank you! Yesterday, I only reinforced the solder joints but it didn't work. I was ready to buy a replacement but decided to give this fix another try. I figured there's nothing to lose since I was ready to trash it anyway. This time, I removed the old solder from the large terminals, applied fresh solder, and then reinforced the smaller joints. I also used a box cutter knife to cut between the joints to make sure that they're not shorting. Voila... IT WORKED! Gotta love this community.
The solder joints won't be fixed by just doing that.My eagle eyes just failed after 3-4 years, the black box, so I heated it up from the bottom with a heat gun without breaking the case, and did this for only a minute with a hot heat gun about 2 inches away from the bottom, and it fixed the leds, they work now, but these would work sometimes and sometimes not, so might not be a perfect fix. Will see.