grey market Nikon camera/lens repaired by any service center

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Have you ever sent grey market Nikon camera/lens to be repaired by any non Nikon service centers?

I know the disadvantages of having/buying a grey market Nikon lens/camera. Nikon doesn't offer any repairs or technical support. My question: DOES Nikon supply parts to non-Nikon authorized repair centers? I have heard that lot of grey market Nikon owners use nikoncamerarepair.com for repair. Have you used them? nikoncamerarepair.com does repair grey market lenses but I am wondering whether Nikon supplies them the required original Nikon parts?

I am planning to buy a lens. The price difference is $500 between the grey and the authorized lens.

Thanks so much!