Yes I know about electric screwdriver issues, but a compressor or bottles to run a windy is doable and I cannot see a problem with spare screws being carried, I agree the fault diagnosis appeared to be piss poor, it appeared to be more of a suck it and see, rather than a logical approach. If you cannot fix such items on first line at the front you are screwed if the war ever becomes hot. It might be an all singing all dancing bit of kit but if in a war situation it cannot be fixed and turned around it’s just an expensive hangar Queen.