The fan is not running and vents icing up. Have defrosted the freezer and removed the screws supporting the molded tray below the internal heat exchanger. I can only get the tray partly forward and down but cannot see what is stopping its removal, a certain amount of levering, swearing and cutting some plastic tape has helped but I am not quite there. Any suggestions would be appreciated. Its about 6 years old and maybe not worth paying to have it repaired but if I can get access and its a motor replacement then great. Model TZA6016FFS.