Pressure valve and washer nozzle
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order.
Wash and check whether the washer nozzle is still leaking windshield washer fluid. If the washer nozzle still leaks windshield washer fluid, replace the pressure valve.