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Are they STK392-110s? or what STKs are they. (theyve used different ones from set to set). Also im not sure if this is the source of the problem, but the reason i ask for voltages, becuase that set has a tendency to loose the 24v supply to the STKs. via Z905 pico fuse openining.
if Z905 is open, youll need to test/replace D909, D908, D913 before attempting to replace fuse and power back up
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