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There are several entities involved in this chain of responsibility: Boeing, Thales, GSYuasa, Securaplane. Remind me if I've left anyone out. Before the fires, this was already a touchy issue. Who is responsible for and gets to pay for the maintenance? After the fires, I'm guessing that not one memo moves within or between any of these companies without corporate legal going over it with a fine-toothed comb.
If parts are on spec and tested as reqd, Boeing will have to pick up the tab on this one, FAA will also pick up some.
History shows us, testing parts on rigs and the like is not the same as bolting them together on the aircraft and operating it as far as possible to service life needs, and even operating test aircraft for years during delayed introduction in to service life (like the A380) still takes years of service life to get them stable.