Thanks mate
A blown BC212 transistor giving a dead short across it. Have they been replaced, and if so, ensure that if they have been replaced with BC212B, in lieu of the original and unavailable BC212L transistors, that they are rotated 120° CCW to match the correct pinout to board layout. Common mistake.
This i haven't checked, I will look at that today
One of the 10way S9E ribbon cables has a short in it. check all links between boards. remove sequentially and see if this resolves it. As I understand, your issue is only on the left hand side of the console (1-24).
Issue is on both sides master ( CH 1 -56) , i have replaced and moved around all of the S9E cables, including the Y split coming from the 88 card