After 3 months I am declaring the splice replacements a proper longterm fix to the self-test faults. See my previous posts for details but I think the whole issue with these self-test failures lies in bad splices and it's a 5 min and likely $0 fix for anyone. I would try that before I would proceed with lobotomizing the blink charger because I tried that and it didn't solve the problem. It's possible other people have other issues discussed in the repair kit, but it seems most likely that the splices are the failure point because they are mechanical and were done improperly to begin with.
Try removing the splice and test the system - does it look like your failure? Now try replacing the splice with a wire nut or soldering. If it doesn't work please post your results but I think this should be the next step for anyone.