I fixed his friend’s Red Ring of Death stricken Xbox 360 by improving the GPU cooling. Because an overheating GPU is a common cause of the failure, he first tried to replace the thermal compound for better heat conductivity between the chip and the heat sink. This helped a bit but within two hours the problem was back. Troubled by the heat discoloration on the bottom of the DVD drive, he removed it and screwed a cooling fan to the GPU heat sink. That did the trick, so he moved the drive to the outside of the case with the aid of a longer SATA cable. It’s not pretty, but it worked.