He sold the cts-v v1 and ended up buying a v2 due to warranty coverage issues, but he didn't fight hard enough in my opinion.
If you have original warranty it would seem likely that BMW would sell you an extension, check the ask a dealer sub forum or a forum sponsor.
Keep us informed.
Rover - 2013 Holden Commodore SV6 Sedan
Clark - 2013 Holden Commodore Sport SV6 Wagon