Horizonal blue lines mitsubishi ws-65813

I have horizonal blue/grey lines that run throughout my picture.  They don't move.  The whole picture is grey, green and blue and I hired a repairman to come fix it over 5 weeks ago.  He has been back twice and took a part with him last time. He wrote Mitsubishi for an answer and so far has come up with nothing that has solved it. He said he has never seen lines like this. Can someone please help solve this?  This is my big screen tv in my livingroom and I really miss watching tv out there.  Any help would be appreciated.  Thanks.