Hi, Welcome to the Club!
You need to remove the O/S/F Wheel arch liner to access the Pump ( assuming its come off there and not a Join elsewhere! ), made alot easier by removing the wheel!
Try using the rear washer for 10 Secsand see if water trickles out just behind the wheel, this'll confirm where it has become detached!
2010 Titanium 2.0 TDCI Panther Black.