Coolant loss

I was losing coolant as described by many others around the web. I found a leak at the reservoir/ expansion tank. It was leaking at the seam that goes around the middle of the tank. The leak was at the rear in the center of the seam facing the firewall. I discovered this when topping up the coolant level. I haven't taken it in for a warranty claim yet. If others with coolant loss could check their tanks and report back to see if this is a common leak point. Filling slightly above the full line/seam will be required to find the leak.