Fixed the fridge not cooling and iced up problem. A couple of weeks later the freezer stopped working correctly and is now cycling between -5 and +1C. Changed the defrost sensor and thermal fuse in the freezer but with no change. There is no ice behind the fan cover and the fan is working fine. No faults showing on testing the front panel. Any ideas other than getting an engineer to check out the compressor? I am at the stage of buying a replacement, so any ideas what an engineer visit / repair would cost?