It was an Apple recall to replace the Radeon gpu, but even after replacing it, they still eventually failed. Either way, you're faced with making the system believe that there is no other graphics processor but the onboard intel gpu. Or, software and a jumper cable to bypass and keep the sleep function working. I've done several and both involve, either soldering wires to pads to jtag code onto the logic board. Or, you could bypass it using RealMacMod's method. The only "permanent" fix is to jtag the unit using dosdude1's method. You can even have the GPU reballed and it will work for a while, but overheat again and return. Some software fixes work for a while, but it always comes back. You'll need a hardware bypass on the grey screen to permanently disable the GPU.
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