Before you send it away for a costly repair or replacement, them maybe you need to take a look at this first:
http://www.yellowlight.co.uk/
It’s a new site that is dedicated to helping you fix the YLOD, and best yet, it’s completely free. All the information is presented on video or with a PDF file. AT NO cost to you.
It’s worth a look at least.

1 Month free rental, PS3 games, BluRays.

DVDs and Streaming Movies.