What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: shortly after takeoff the aircraft experienced a load shift as the P1 container slid aft to the previously empty P2 position. Unable to slide the container back to the P1 position, the crew secured the container, moved the contents to the P1 position, dumped fuel and returned to akl for a normal landing without further incident. Subsequent investigation revealed the pallet to have a much "thinner" base than other pallets and even when locked into position, the locks could be disengaged by rocking the container by hand. The pallet had been used on another aircraft with "overlapping" edge rails which this aircraft does not have.
As the FAA filed it
NARRATIVE: SHORTLY AFTER TAKEOFF THE AIRCRAFT EXPERIENCED A LOAD SHIFT AS THE P1 CONTAINER SLID AFT TO THE PREVIOUSLY EMPTY P2 POSITION. UNABLE TO SLIDE THE CONTAINER BACK TO THE P1 POSITION, THE CREW SECURED THE CONTAINER, MOVED THE CONTENTS TO THE P1 POSITION, DUMPED FUEL AND RETURNED TO AKL FOR A NORMAL LANDING WITHOUT FURTHER INCIDENT. SUBSEQUENT INVESTIGATION REVEALED THE PALLET TO HAVE A MUCH "THINNER" BASE THAN OTHER PALLETS AND EVEN WHEN LOCKED INTO POSITION, THE LOCKS COULD BE DISENGAGED BY ROCKING THE CONTAINER BY HAND. THE PALLET HAD BEEN USED ON ANOTHER AIRCRAFT WITH "OVERLAPPING" EDGE RAILS WHICH THIS AIRCRAFT DOES NOT HAVE.