Quoted from PinballNewb:
Playfield GI is still incandescents. I did however just fix a burnt connector that had taken out my backbox lighting. I replaced all lights in the backbox with leds. All inserts are led and have been since I've had it. You have me thinking about the backbox lighting now....It had been out for a bit of time and I never noticed any problems. Maybe I'll unplug it and play a few games to compare with it off.
I'll take a look at the extender you mentioned. Thank you.
I would also lift up the mini playfield and make sure all the wires are routed correctly beneath there. Very easy for them to get in a bind or get pinched. Either could be causing intermediate interruption of power leading to the random kicks.
Also, I'll try to look back through this thread for it, but if you repinned your backbox connector by the book, it will be incorrect. There is a misprint in the manual. Not much of an issue with LEDS, but with incandescents, there are too many lights on one string and it'll blow a fuse that takes out the lower backbox and the top left playfield GI. There is a pic of the correct pin locations somewhere in this thread.
Edit: Found it