It appears to be one of the linkages broke and either the kruger flap retraced or didn't extend. Its a cast linkage, and it could have happened to any airline or any 747.
AJ if I remember correctly the VCF's (ANA 744) there are also linkages that are there to, and they are attached by nuts and bolts, which could have sheared off thus explaining why it is partly broken, and when retracted they are hidden away in the wing so no one would have seen it until a A check when the flaps are deployed and inspected.
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