The Boeing repair teams never turn up on site until they have absolutely everything in place and ready to go.
Harr-UMPH!
About 25 years ago I was assigned to a project across the pond. I had never been associated with this hardware set to that point, but was assured it was "just like the last job".
So when I stepped off the plane, I was immediately hit with "Where is xxx? And we're still missing yyy and zzz!" about three IPC pages' worth of hardware was nowhere in sight, because of configuration differences.
After ten days of followup from the logistics gurus, who had been gathering bits and pieces from three countries on two continents, the customer said I might as well go back home for two-three weeks while they worked on production schedule. I was left holding the bag; my only excuse was that I never should have taken the job under false pretense.
But when I finally returned, the job went smoothly, per plan!