First of all let me say the new training scenario by Claudio is awesome, he surely put a lot of thought and effort into it! This is the first time I tried a training scenario, and actually the first time I tried failures in general

But I'm having some problem executing the NNC, and I'm wondering if I'm doing something wrong or if it's something else:
When I'm at step 5, I
- set the BUS TRANSFER switch and both ELEC HYD PUMP switches to OFF
- start the APU
- once the APU is running I switch the APU GEN switches ON (one at a time)
- => the SOURCE OFF lights always stay illuminated and I remain without power
Why doesn't it work for me when I follow the steps exactly ? I'm using the 737-800 scenario, in case it matters...
Thanks!