My sons box went 2 red lights so tried this but 5 mins later 2 red lights again so tried the xclamp but still 2
red lights

and was getting error 0013 which is the ram.
So used Wilhiems tutorial to reflow the cpu/gpu and ram chips then applied the replacement xclamp but didn't have 1mm washers for the ram chips under the heatsink so used 4 layers of double sided thermal thermal tape (0.33mm each layer), then using more double sided thermal tape stuck 2 uk pennys together (4 times) then stuck each pair to the ram chips underneath the board, drilled the case so the new bolts for the xclamp were clear of the case and screwed the motherboard back in.
Ran the box for about an hour and felt the metal case and it was hot where the pennys are so know they are conducting heat away from the ram chips

, it's only been two days but the son did play for 6 hours last night and all games were running smothly (he mainly plays cod4).
So no one fix but a combination of 3 fixes to fix the 2 red lights (error 0013) here.
0013 is in 99.9% of the cases not an overheating issue but a cold solder joint like 0110...
It can almost always only be fixed with the heatgun, to use this fix in addition with any fix is never a good idea because the flexing will cause it to break soon again.
Since this is only for people who are looking for a temporary fix you can still try to fix it with this one you might be succesful if it is one of the bottom RAM bricks...
If you want a permanent fix heatgunning + x-clamp replacement is the best choice...