I have a CL 710 that I purchased new in May 2003. In 2006 when the unit stopped firing up, I had an authorized runco service/dealer send it in to runco for service. Don't know all they did but supposedly they cleaned it up, re-calibrated it and sent it back. Cost me over $1,500. Now, I'm having the same problem again -- the unit tries to boot up but goes into fault mode (red flashing light) which indicates a problem with a fan. I'd rather not spend another $1,500 to send it in again. Any other things I can try (like blowing the fans out with clean air) that might get me up and viewing again?