Looking for advice... My Roadster started throwing "coolant system error" messages and wouldn't charge. Was sitting at around 50 miles remaining. Tesla had the car for a week diagnosing, left me a message on Friday saying they thing it is the water pump, it has to be ordered from Europe, and will be $1100. I am concerned about the battery being left sitting at a low charge for an extended period of time. I asked Tesla to charge the battery when I brought it in and reminded them a few days later, however they say that 50 miles is an ok charge and not to worry. Last time I left the car at Tesla for 2 months it lost about 8 miles of range, and that wasn't with the battery this low. What should I do?