Just curious, my 612 is leaking fluid from the drivers side front. It doesn't look like oil, perhaps hydraulic fluid. It's going to the dealer Monday, but wondering if there are any common leaks from that area.
mine leaked transmission fluid from a bad seal when its only 2 years old with maybe 5k miles on it. lucky it was fixed under warranty. dont know if its common though.
Brake fluid tank. Had a similar issue with mine, slight crack due to plastic aging. Make sure you ask them to clean the firewall well before installing the new one. ~$300 labor inclusive. Good luck!