Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Within the United States, the best place to send a Nikon instrument or device to, for repair, would be Nikon Repair.
You may start the repair process here:
If you would prefer to locate a nearby Authorized Servicing facility, you can try this page:
where you should click on 'Browse' and then choose
Nikon 1 Speedlights
and then choose
SB-N7 or similar (since your 700 is not listed specifically) to find locations... there aren't many of them.
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