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Friday 11 May 2018 at 14:28
Quoted from Cycloneman:test all diodes on those switches too
When diodes are dead, this affect switches but not DIPs. As the high-score is no more displayed, this mean that the DIPs are not correctly read (so seen as "OFF").
Sure the issue is at Z13 or U4 area.
Source: http://pinside.com/pinball/forum/topic/gottlieb-sys80b-switch-issues-after-short#post-4392040