Hopoint ffa70 - freezer section not working properly?

After a 4 day holiday came back to discover freezer door slightly ajar. High temperature light and defrost warning light on. Food ruined and thrown away. Reset everything and after 2 days all lights out, but, although freezer temperature measured at -10 degrees, not freezing food properly and fridge now started leaking water from inside behind salad boxes. Can it be economically repaired or just replace?

James
May 2010