I have done that same kind of switch repair in the (distant) past - undoing crimps, recrimping. I'm going to pull it out, put a meter on it and see if I can replicate poor continuity. Then possibly try to resurrect it. I saw a comment online that there is an internal spring that can weaken. Same spring perhaps that returns key from the start position. That might explain why some people report rotating slightly counterclockwise while car is running corrects lights issue. This car is not needed so I have the luxury to experiment.