Just before Xmas my Xbox froze in the middle of game. When I turned it off and on again I got an E68 code error and a solid red light. After researching the issue may be the hard drive I removed it and the console worked fine. So I tried it with another hard drive and the error occurred again suggesting it was an error with console. I booked it in for a repair and sent it to Microsoft. In the meantime I borrowed another Elite S and used my hard drive in it with no issues for 3 weeks, confirming the issues seemed to be with the console.
Yesterday it came back from Xbox saying after extensive testing they could find no fault. However after 30 minutes of plugging it back in it froze and the E68 error code showed again. Can anybody suggest where the fault is? I am going to ask MS to look at it again but if they can't find the fault am I missing anything obvious?