Quick update...I've removed the pump motor and cleaned the plastic filter, I also removed the motor cover and cleaned with electrical contact spray.
The filter was almost fully blocked with old oil sludge. I refitted the pump and filled with new Volvo oil, ran the car for a mile and topped up again.
Ran the car again for a few miles and next morning the dashboard warning for AWD disabled had gone.
Last night I plugged the laptop in with Vida and cleared the codes.. alls good..Image Link Below
https://www.dropbox.com/s/7l1j13x0sf...25053.jpg?dl=0