See this thread, most of it is applicable to Spike in general - https://pinside.com/pinball/forum/topic/what-are-your-thoughts-on-the-spike-ii-system
Some useful info there, but I'm not sure you will find much of it very encouraging.
On the positive side, usually an LED going out (short) ruins the whole board, as they're so delicate and there's no fusing whatsoever on Spike/2. That hasn't happened to you, so hopefully you find someone with the kit and skills to replace the LED.