Good discussion here about the caps:
https://pinside.com/pinball/forum/topic/replace-caps-on-afm-strobe-board
I still haven't been able to get the strobe board I've been tinkering with working.
https://pinside.com/pinball/forum/topic/strobe-board-not-working-afm#post-4483764
I really like the idea of an LED replacement. I've spent way too much time on that darn thing.