I have a Zanussi Freezone Fridge/Freezer. ZK 56/38 RF ZEM GLY 80AA R134a. The fridge is at the top: the freezer is at the bottom. Every time the freezer door is opened some water leaks from the bottom of the door seal. There is a thin layer of ice on the bottom of the Freezer section. Inside the bottom food box there is a small amount of dust-like frosting. Otherwise the unit works perfectly. There is a small squashed pipe leading into the evaporator pan. Can this be cleaned from underneath?