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Update.... Chip Chester you hit that one right on the head! A number of smaller caps leaked out on the Video Proc (VPR-1) board in the input block and DAC areas and over time the contents eroded the traces away thru electrolysis. The caps in question are all local supply decoupling filters and I suspect their failure was a result of HF supply ripple getting thru after the supply caps popped. A weird failure indeed thats exhausting my parts supply, all the boards are going to get re-capped on the supply rails.
I owe you a cigar!
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