Has anyone upgraded from SR to SR+? What was the process? How much did it cost? I am tempted to get AP now that it is discounted to $2k, but thinking of just upgrading it to an SR+. At the time I bought my SR at the end of 2019, I believe the upgrade cost ~$5k. But now with the $1k discount on AP and the recent $2k price drop on SR+ (and other Model 3s), it seems like the upgrade from SR to SR+ should be less.