RNZ reports last week the runway required additional temporary patching on top of what was done in March and April.
The Bank's acting Pacific director, Lasse Melgard, said the latest problems are in a new area that had not been identified for emergency repair work earlier this year.
That work has been financed by the bank which is providing an interest free loan of $US59 million for a more permanent overhaul of the runway, lighting upgrades and other facilities.
He said they hope to be inviting bids for this work by October.