The problem is that there are many of these planes that have already been delivered. They're going to have to find some way of ensuring QA for those before they're allowed in the air again.
Right. They have to be taken apart. All doors have to be checked systematically and also they need to do random probes to sample for possible other systematic manufacturing defects.
Probably talking to their mechanics, they might quickly identify other problematic components which might have been noticed during maintenance but not strongly enough reported and tracked. Basically everything that needed repairs which shouldn't have been needed.
