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Good news that it is working now but please! Do me, yourself and the community a favor and do the shroud divider and GPU airflow mod in conjunction with the x-clamp replacement.
Belive me it helps a lot.
On one of the boxes that I fixed, I had some artifacts. It would throw artifacts after about 5mins in the dashboard.
Then I did these mods and it didn't throw a single artifact after ~2hours hardcore gaming! It has been working fine for now.
well actually I did the shroud divider a long time ago, before I got the RROD. I agree that it helps a lot, more hot air is kicked out. I also got the talismoon fans, and I used tape to improve airflow (some of the RBJtech mods) .I don't know exactly what you mean with GPU airflow mod but I guess you are refering to the tape.
But then I got the RROD anyway even after all these precautions.
But the xbox is still running fine now after 3 days