Sorry if this sounds a bit rude but only a fool would go replacing parts one by one on a trial & error basis. Sure, eventually you may be lucky & get the right part & fix the problem but in the meantime the cost of all those uneccessary parts replaced is wasting your money. If you don't have the knowledge & test equipment to fault find the exact faulty part then you would be better off getting a repair person to come & do it for you. Will be much cheaper in the end.
Lincoln Appliance NZ, April 2009