Sony kv32 fx 60

Hi guys, had this tv for 13 months and for the last 6 months the pic has gone out of focus and it also has a very bad yellow staining in bottom left hand corner and top right . The fault has been reported to sony ( 6 times over last six months ) who have had engineer out 3 times and taken set in once to no avail.
Know at long last sony have decided to replce set with FQ65 i live in hope. Has any one else had similar problems as me .

Thanks alot....