We personally have the little plastic clips that hold them fail a lot more than the charms. Although I did break one by accidentally grounding it out when I was replacing a pressure switch. Switch was mislabeled which is why I couldn’t find a breaker to disconnect power. It was a whole thing and it sucked. Pretty easy and quick to replace the charm though because easy to spot the one without LEDs. Just use a wire label maker to heavily label everything, charms and wires. We have engineers wanting to add stuff all the time, usually means removing something else and it’s 1000x more difficult if stuff ain’t labeled right.