After a wasted day troubleshooting my defective 024 Logic Card, I found out that I was not getting anywhere because my Extender card had a broken trace.
Just a reminder for all of you - before working with an Extender Card, check the Extender Card itself for damages! In my case the trace was loose and created a short between different voltages. Sparks flying out the Centre Section. Fun! But at the end of the day nothing got damaged except perhaps the card that was defective anyway!
Have a great day!