I had the primary charger in my 2013 Model S fail. It would fail the self-check as it attempted to ramp up current. I had the unit returned to me after I had it swapped out. I'm selling it to someone who would be interested in repairing it. The unit is has had the cover removed for inspection, but no internals touched. Car has never had water intrusion. Unit never operated outside of spec (i.e. too high input voltage, etc...). Unit was removed by Tesla Service Center. Service center charge for new unit and installation: $2,500. I'm asking $1,000.