2 red lights

I bought an original X-box 360 the first day it came out. I started getting the 2 red lights on the left side of the power button. I took it all apart and found dust everywhere. I cleaned everything with alcohol and got it working but it was still apart. When I got everything back together it was back to red lights. I took it apart again and even removed the x clamps off and cleaned the geu and ceu. I know it cant be overheating because it gives me the lights when I first turn it on. Is there a temperature sensor circuit that could be malfunctioning or possibly a solder crack somewhere? I've looked it over a hundred times but cant see anything obvious. Hopefully you can help.