Sorry, but it is not covered by the power-train warranty. I had this same issue and the Nissan part number is the whole subframe section for ~$900, and not just the bushing, so it falls into the chassis, not the power-train, for warranty purposes.
Just get the whiteline poly bushings for $98 and install them yourself.
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2010 Nissan 370Z 40th Anniversary Edition #762/1000 | Forgestar | Michelin | Swift | TRS | Z Speed | ARK | Z1 | Hawk | CFE | Evo-R | GTMat | Stillen | Seibon | Whiteline | Pioneer |
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