A possible reason the dealers that didn't sell it will not fix it is some manufacturers do not pay out for the labour on warrantee repairs, they just supply the parts. I found this out when I was having issues with my Hyundai's and was told by the dealers that they didn't get paid for labour.
It also happens in other industries. Companies we were main dealers for mainly covered our labour costs or provided their own engineers, but our main supplier would not pay our labour chargers when we did warrantee work. The excuses were you absorb it from your retail margins.
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