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Long story short... bought a CPO, 2012 Signature Model S with 21-inch wheels. Everything looked great... had 50K service done, which supposedly included 4 wheel alignment and measurement of tire tread depth (all were 9 or 10/32). This was October 5.
As of now (January) I need to have all four...
I had my entire pano replaced under warranty during a 50K mile service, and it hasn't been the same since. The old pano (2012) was not working right, so the technicians said that a new pano (with a different design) should be installed (free... and hey, it's "new").
What a mistake. Now...