After 27k miles, my master charger died on my 15 month old MS. I went to get in my car Thursday morning and while it appeared to have charged that night, there was the dreaded red ring on the charging port. Thought maybe it was the cable, so I tried my spare cable and no luck, even tried a different plug at the house. Called Tesla service, they downloaded the logs confirmed it was the master charger and sent a loner MS to my house. Car was fixed within 24 hours. Great experience with Tesla Service here in Dallas! Although, kind of wondering why the master charger just decided to quit now.