BOAC,
Bewildering array or not - I think if you look at the picture in the report, you might wonder "why is that one with the little white ring on it pulled out", even if you had never seen a 767 flightdeck or Boeing breaker before.
A simple 10 second scan of the bewildering array might have made you think "what happens if I push this back in"? There being no collar with tag from maintainance to tell you not to...
I gather many pilots have used CB's to shut up annoying buzzers (that might for instance tell them CFIT is a bad idea...), or if not seen the memo's telling them NOT to...
So - given that I am sure your rating gives you a passing familiarity with the bewildering array - back to "why didn't the checklist ask the crew to CHECK CB's"? (or did it?).
Over an hour for the peeps on the flightdeck and in the help centre to think to check the ELECTRICALLY powered backup had ELECTRICITY...
