Somebody decided to lower costs in some area to make them look better to a boss to get a bonus.
Insider blogs and forums already discussing the particulars of this one.
To illustrate one I know about, a bull plug blew out on a high pressure vessel resulting in similar $ loss.
The bull plug is what you unscrew to stick an x-ray prob in to look for cracks and other damage.
Well, during a turn around some well educated idiot 'decided' not to replace it, "we do it next time."
Which was that? There have been few that reach this level of cost.