I stumbled across this item for sale that looked interesting - can't find any mention of it in the usual forums or facebook groups:
jcm-1.com
Both of my SE/30s work, but I kinda want one just to be mesmerized by the blinkenlights! I like the ground connections and easy test points for oscilloscope.
Here are some videos about it:

Mac SE/30 Peeker Diagnostic Kit (v4.5) - Joe's Computer Museum
Fix your SE/30 Board with the Mac SE/30 Peeker! The Mac SE/30 Peeker helps identify issues, provide real time monitoring of important signals, and assist in repairs. Plug it into your PDS slot, then get full insight into voltages, address and data lines and all the processor signals! Find weird...

Both of my SE/30s work, but I kinda want one just to be mesmerized by the blinkenlights! I like the ground connections and easy test points for oscilloscope.
Here are some videos about it: