[Dano]

Have repaired a couple of RROD'd xboxes using nothing more than the xclamp mod (basically a set of screw, washers, thermal paste and alcohol swabs) which is available for pennies on ebay, no baking, reflowing or anything, just strip the thing down, remove the cause of the issue; the xclamps that hold the heatsinks in place, remove old thermal paste, apply new stuff, re-attach heatsinks using washers and screws supplied, put back together; job done.

The hardest part is getting the thing to bits and keeping all the heatsink screws in place when re-building.