Dave,
What about "9A"? Any damage to that trace? Both 9A and 9B are tied to the 33.5 Common return. Are the fuses on the +33.5 Supply the correct "Fast Acting" fuses of the right current rating? I do not have answers to your other questions. I have never encountered or even heard of this phenomenon and I have several Power Modules as well as 2 dozen working plug ins.
The only way I have burned up a trace is when I plugged my flexible extender card to the module "upside down" (I know, DUMB Move!). I did have a few components go BOOM when i turned on the power. .
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Michael Lynch
Dardanelle, AR
Michael W. Lynch