The problem is with the quality management throughout the manufacturing process and not with the specific airplane model except that the manufacturing sites vary between the models.
As the production probably cannot be easily moved, a replacement just isn't available and the market just needs a ton of 737-sized airplanes, the only solution is to up the game along the production line quickly and massively.
As the production probably cannot be easily moved, a replacement just isn't available and the market just needs a ton of 737-sized airplanes, the only solution is to up the game along the production line quickly and massively.