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Quoted from SPARKY70:GPE is out of stock on the 7408, but they have 74F08 in stock In this situation this is an OK substitute. Quoted from SPARKY70:I also powered the game on, and the beacon turns on immediately as you described. According to above my U20 is bad. I had a fifty fifty chance!

Source: http://pinside.com/pinball/forum/topic/1986-sys-11-high-speed-police-light-not-working#post-4366482