I've been having a coolant leak problem. Took into a shop and they replaced the crossover pipes. The leak stopped for a few days and now back again. I attached a video of where I see it leaking from and not sure whats going on here. Underneath from passenger side. Any ideas??

 

Is it running down the front of the engine? If so, it could be the water pump (fairly easy driveway repair job). There is also a small connection into the front of the water pump, mine had been leaking from that spot (bad o-ring). Check that also.

 

Ran into a coolant leak on my '18 XF at 45k mi. There was a pinhole leak near the reservoir filler cap that was easy to locate, thanks to the white smoke it would produce after the car had got up to temperature. It also left coolant spray along the adjacent face of the engine. Sadly, I can't quote you a repair bill as it was covered under warranty, but I believe a section of piping was replaced. Good luck!