Windscreen Washer Pump

Hi Folks.

Im an old member as I sold my beloved albi 197 a year past February but have found myself buying another 197 this time in red. Just looking for some advice. When I pull the stalk towards me to spray the front windows, no water comes out (maybe a trickle at the most) but this action brings on the rear washer but no rear wiper movement.

Am am I right in believing that it's a faulty washer pump and the valve has stuck in the rear position? If so, can anyone shine light on accessing the washer pump?

Thanks in advance, Craig
 
its located in the drivers side front wheel arch/wing/behind bumper and if like the 172/182 its a single motor that does both