I do not think it is the role of the OEM to police which airframe should be flying and which airframe should not. (especially when it is in their best intrest to "black list" as many serial number as possible to have the least airframe loose on the market)
why do we have an airworrthiness certificate system then? are we saying it cannot be trusted. if something can be repaired, or inspected according to established procedures, it should get an authorized release form, and if it does it should be authorized by the authority FAA - EASA - CASA - CAA ....