Quoted from vid1900:Those are probably on the AUX Lamp driver board, mounted between the displays.
Print this sheet, it tells you where each lamp's driver lives, and what number SCR it is and what color the wire is:
http://www.pinballrebel.com/pinball/cards/Tech_Charts/Bally_Xenon_Tech_Chart.pdf
Thanks, I had this but forgot I had pulled this off one of your other post. I was just looking at the manual. I'll have to take a look, see what I can find. I'll struggle for a while, but with the great info you guys offer on this site I'll get better. I've had and still have other pinball machines, but they were in great shape and I only had to do minimal work. Thanks again Vid!