Hi, I have a D&D pinball machine and i know eventually lights will burn out and need to be replaced. I looked under the playfield and noticed that the majority of the lights have one wire going to them soldered to the metal base that holds the light to the playfield and occasionally held in by staples. Which looks like it will hinder the replacing of the lights as it seems to be pretty tight. I've been told that this is a common ground wire and if it gets broken when attempting to replace lights that are underneath inserts it will need to be resoldered. What will happen if it isn't soldered again will the lights not work or something more drastic?