Here's a link to the service manual:
www.talonix.com/images/RU-42PX11_Service_Manual.pdf
One caveat - the wording is very hard to follow, as it's translated from Korean quite poorly. I'm of no help with Plasma sets - I've never worked on one.
I'll keep the link active for a few days. Post a reply once you've downloaded it. Usual disclaimer - I'm not responsible if you pull a no-no or worse....
Cheers,