They're not monitored, so no way to know they're broke unless you look.
There's a surface mount resistor that gets fairly hot, and from growing and shrinking it eventually cracks the solder at one end.
I put new ones in, then fixed the old ones, then added blue LEDs to get an eerie purple glow and swapped them back in.
If I get tired of the purple I have 2 brand new ones in my spares stock.
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Warning: May contain traces of nuts.
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