So one of the things I remember hearing is that the contracts that Boeing has in place with its vendors (who they're outsoucing stuff to) is not really helping the situation.
If a vendor provides something that is inoperative or not within the design specifications, Boeing receives a service credit for more free service from that company. The problem is that there are some vendors who are repeatedly violating (due to inexperience, technical issues, etc) the service level agreement and Boeing has chalked up a TON of free service. The vendors, knowing they're practically giving away free work therefore have little incentive to go the extra mile and get things done on time when they know its going to be awhile until they see their payment.