After you have done the NNC and the APU cannot be connected to the bus... Do you keep on doing checklists while you divert to an appropriate airfield or just keep the lights illuminated?
The QRH assumes that all lights are " reviewed".
In my mind that doesn't necessarily mean the checklist is actioned, but it would be a good idea to review them all in case something else is going on. Part of that reviewing process might be checking the checklist for further considerations etc.