Is that image from an official Infiniti service guide of some sort? Link to such a guide would be appreciated so I can approach service with something official.
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Mine is stretched further than yours is showing. I'm also getting the high pitched squeal above 3000 RPM under load. I'll bring in the car soon to get it addressed. I could change the belt myself, but I assume that it would be covered under warranty....
I'm sure most dealership would address it and cover under warranty as long as the tech can confirm the squealing noise.