Unfortunately, the entire P3/P4 Truss was produced in the USA by Boeing.
My wife is Boeing Software Systems engineering manager (for ISS last year and shuttle this year).
It was funny when last year they were running studies to determine risks when all crew members (2?) were doing an EVA last mission (from ISS i believe), with nobody incside.
It was pretty nervewracking to think that while they were both out on EVA some problem could arise that could strand them out there (I told her they need a remot door opener like on a car, like a smartass. BTW do the ISS headlights flash off and on and horn beep when they lock the doors??)
She had to make sure that any software failure, power failure condition could not arise that would leave them in trouble.
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What an absolutely incredibly vulnerable feeling that must be for both of them to be out on EVA and nobody else inside??