If you're not going to send them back to Nikon (from what I know, they're not as accommodating as other brands when it comes to repairs/warranty work) - then I'd recommend you send them to a well-reputed binocular technician overseas. I wouldn't take a punt with somebody in NZ.
These two are the best in the business.
1) https://suddarthoptical.com/ - good work, but a bit pricey.
2) https://www.opticalrepairs.com/ - rather quick turn-around, and reasonable prices.
For bino repairs, expect to pay at least $300 or so for a general clean/service. It can add up to more if there's significant damage that needs mending.
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