Air New Zealand A320 ZK-OJM operating NZ992 Auckland – Apia was at the top of the climb at 31,000 ft this afternoon when it turned back towards Auckland due to a technical issue, descending rapidly to 15,000 ft close to Whangarei and heading as far north as Cape Reinga and as far south as Tauranga to burn off fuel before making a safe landing at Auckland. The flight was delayed overnight and passengers accommodated.