The flight deck made a few frantic phone calls to Ops and consulted the POH with an attempt at a system reset; no joy. They then looked at the CB panel behind the FO - funny ole' thing, one had tripped!
I think we are missing the point and drifting away from the crux. I don't know the AB. It seems from some comments that a 'system reset' can be done other than a CB pull/push, as it would be necessary on B737. I've not been talking about system resets, rather than assessing why the system failed.
My comments are simply this: if an electrical system fails, and there is a visible CB panel, why not check the CB's first before diving into resets and maintenance phone calls etc. Start with the basics and move upwards. Perhaps a 'stone-age' thought in todays wiz-bang jets, but in this scenario it seems it would have been relevant.